Malicious PDF — malware analysis report

Static analysis result for SHA-256 40539e8b0de7fffc…

MALICIOUS

PDF

54.5 KB Created: 2020-08-29 22:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 51869f20155d4f05b474fee987cc737f SHA-1: 6ad7b2364b2246f032f280a7d5904f75a097b6e5 SHA-256: 40539e8b0de7fffc5b9288b6a7938a7fdfa5adfe31745f22900d3d59a812989e
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that suggests a lure for downloading an 'apk file', and a heuristic firing indicates the presence of a visual download button. The primary malicious URL identified is ttraff.me, which redirects to a file hosted on static.usrfiles.com. This suggests a social engineering attack aimed at tricking users into downloading potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/wix?keyword=minion+rush+game+apk+file In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d62850a69bce4714945bf12a3aba08a6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_fa89c02855b941628bacb9b8834f225e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8298f1fa6bdb441c93f0ece271c65248.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_e46635d64f244134a53be0cee9b98566.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4dd980_ec69d670cc6f486781b913856f803aa5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0d2908_e19c34c5dd27437c8d50e2132b974fe5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2a5aa4b91117444d966558782b815cbe.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2a92d4228df245729137bddd11933ccb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4cea11174dbc44afa9a07ec8658a7a10.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_71bf347a23e549af87e1aa222d67113b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_7e39c992a4b74e0f9d33056ae11eda31.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_67f954714fd845bf9e5cb4d42bc17c94.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_5ebc31fccf7147f5b53ae8a6e3b817d9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/dms._vizio_link.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/bankruptcy_act_usa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0675/4970/files/aicha_cheb_khaled.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/reverse_foil_method.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/tikopapuxizira.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A19 5384 bytes
SHA-256: 72ba0525f3d54701dce1be2108b473e32371b88e0991c8baf9163b9210dbc20d
font_01_sfnt_off00007c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C43 6904 bytes
SHA-256: 5c79fb59a574367cab838c2b0f8f6b3837cfdb2b0b67e6759f026d8a474d4f23
font_02_sfnt_off0000937e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x937E 10060 bytes
SHA-256: e54483e00096acebd247d6e4d5674f852e7e71b25b3059910e17e3446015d797
font_03_sfnt_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 16492 bytes
SHA-256: 89748e4e0f650d671d3765835ff3d7879aa2ce4fb583dae4b1762053d9460800

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