Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f07a79bb0ba0046…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 16:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7b210db666012fbc65ca06c5c1ae272b SHA-1: fc2477729ddd117101bc56a305ff8a7180cb4bf1 SHA-256: 8f07a79bb0ba00469c01dd63c1da9c4f67346e0a48187399a645e23e51331d10
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=cobalt+chloride+equilibrium+lab+answers'. The document body, though heavily obfuscated, also contains this URL, suggesting it is intended to lure the user to a malicious site under the guise of providing lab answers. The file also contains a large number of embedded links, characteristic of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/wix?keyword=cobalt+chloride+equilibrium+lab+answers 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/f09a9d_4a3662b011ad4e6883f1ef48eed4987d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0cd019_a42129c90a5b476ab7d61945873cae01.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/10e3af_09dbf89e91364a719f9894c8b96c710a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c162b3_b7ef90e1d6824bc784611fe7cedcbafb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_623562211cd74c198580d61541629065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4976/9367/files/cengage_maths_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/32577536179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6653/8649/files/71948197268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/pibasedazonitiluri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/56221459819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/rolegivogosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/xufonarojefakalulezal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/legabejowuwelisobe.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 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54FD 5444 bytes
SHA-256: 4a6a2a318887c469c7f8b2be41434642842f61e19ed61afeb89bf46386681642
font_01_sfnt_off00006752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6752 10184 bytes
SHA-256: de162bd3d4359d86e278a0836d906372137569dffaf74faa558a6b2b277459c2
font_02_sfnt_off00008a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A63 16100 bytes
SHA-256: dfdc6983d3c42b81f9741fa6cdceaab3e97c1fbda00e6274acf933e6ff911e94

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