Malicious PDF — malware analysis report

Static analysis result for SHA-256 638f1ee5e645fb28…

MALICIOUS

PDF

45.4 KB Created: 2020-09-01 01:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd53852b74f80231125ed799718b52ef SHA-1: 756630776b5a8f7b07489d9bfe75e55fcf17115d SHA-256: 638f1ee5e645fb28303ebb2b279635b8029c5782dbd61115aed2160da9468d1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, masquerading as a resource for educational answers. The primary link, however, directs to a known malicious redirector infrastructure, indicating a phishing or scam attempt. The PDF_SEO_LINK_FARM heuristic further suggests a deliberate attempt to create a large number of links, likely for SEO manipulation or to distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wix?keyword=human+cheek+cell+dna+extraction+lab+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/4963/6255/files/modoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4546/1909/files/88802681189.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/96534436480.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/enter_the_gungeon_evolver.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/xizujix.pdf
    • https://static.usrfiles.com/ugd/99965f_51d4d644abae4952b04e4096e71b8247.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb3e1e059e0749269d4556dbfeadb537.pdf
    • https://static.usrfiles.com/ugd/fe83c3_96469fea0d734030b30d59a9e5323ee2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b17ce93c91c3442898b4e0ee7fd53639.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_3dd54252e7c943e9af5a16ad4d8dd8fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9acda9ffa934ff98a9452f81e46c4aa.pdf
    • https://static.usrfiles.com/ugd/c0fca2_81ab9fefb26f4bd799a6fa229fc1d357.pdf
    • https://static.usrfiles.com/ugd/88a84f_5d08731398f94c0e83e80b897f4ef5d7.pdf
    • https://static.usrfiles.com/ugd/2813e2_eb873727f17a45d2861e06343f495899.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b392e50b92442a1ba649909610dc163.pdf
    • https://static.usrfiles.com/ugd/b8c837_4539d682baaa4f88be36f210befbf504.pdf
    • https://static.usrfiles.com/ugd/ab63e3_f113107b51c74985b4d0795dda925715.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072c9.bin
06cafaf153a1204fc513b60f310f0c9878737292832d6e71b445bbbdebe61028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C9 5504 bytes
font_01_sfnt_off0000855c.bin
b9d5c75745ce4494f19c49db85f9d3b5a57228d501c3ffac040241ff9dfea24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x855C 10284 bytes

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