Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ffb23bb97da5a3…

MALICIOUS

PDF

48.1 KB Created: 2020-08-15 03:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 554535efd670a7b62d9a11784c6aadfe SHA-1: b770d0a6279547e6ddd126ba5889578433547453 SHA-256: 81ffb23bb97da5a32d9f4b14cd578b302f3a7cbf638da328de7d92141b57b633
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including links to a known malicious redirector and a large number of external PDF links, suggesting a link farm for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The embedded URL and the presence of a 'download button' lure indicate an attempt to trick the user into clicking through to a malicious site, likely for software piracy or malware distribution.

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.com/pify?keyword=autodesk+autocad+2008+free In PDF document text
    • http://kipiv.ascendingscore.com/uploads/1/3/1/3/131384401/a4fd8194c8.pdfIn PDF document text
    • http://jepixukaj.tyewinkinmink.com/uploads/1/3/2/7/132741099/4928530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/quest_diagnostics_order_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6209/9097/files/sabosadesanudidobon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/21798577856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/hola_vpn_for_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/jirujutifebim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/vuxufuposaxuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3942/4663/files/33609368362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/gekogasitokekax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/10650862706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8165/3655/files/dunifuripof.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

Related samples 8

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_off00006036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6036 3608 bytes
SHA-256: d4924a8d788e2192e4577cb9dc6373b302a86eea2c171841f4a92c2b18ab832f
font_01_sfnt_off00006d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D02 5504 bytes
SHA-256: 058d57669d09845f075d5e58c75c4b410f473a5f0566a440f25fa1d3e18832ee
font_02_sfnt_off00007fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBC 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_03_sfnt_off0000884a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x884A 13216 bytes
SHA-256: c61b1430e4d2feb17cc775ab850401412490d0bb2bef3e291c35fe24df9b691c

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