Malicious PDF — malware analysis report

Static analysis result for SHA-256 844e0ebf32008e63…

MALICIOUS

PDF

44.6 KB Created: 2020-08-12 20:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7de3de7a9f7c38ac1177fcecdc1b99e1 SHA-1: 1b259fbf8d32e638c17e749e232185b6d2b963d0 SHA-256: 844e0ebf32008e630efaf65db690ae8ec18859ecb2c963242714c92f66531216
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body also contains this URL, disguised as a free download link for a technical manual. The presence of numerous other PDF links, many benign but some unknown, suggests a link farm used for SEO poisoning or to obscure the malicious redirect. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.com/wb?keyword=molecular%20cloning%20a%20laboratory%20manual%20sambrook%20pdf%20free%20download
    • http://files.dufferbud.com/uploads/1/3/0/9/130969206/wawuzozizolovojuv.pdf
    • http://nasedek.lorisen.com/uploads/1/3/2/6/132682892/xamud_lejakewoj.pdf
    • http://files.pvtechsolutions.com/uploads/1/3/0/7/130775529/pofapirusinuxela.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/bowerman_v_abta.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/69649048839.pdf
    • https://cdn.shopify.com/s/files/1/0434/6927/5286/files/37916981918.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/gta_5_mod_menu_xbox_one.pdf
    • https://cdn.shopify.com/s/files/1/0438/6793/0789/files/b._sc_2nd_year_maths_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/24422098494.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5957/files/singapore_payroll_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/4203370015.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/49163251829.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/bobasusukefesoxixa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dde.bin
743adc92d21aabe220e124947e34ce50f7b3229c6fdc98fe018fd85b451f542b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDE 5760 bytes
font_01_sfnt_off00007177.bin
f84186298cf2445e22f522fa65b27c1a0b72cca6e32350df5311dbbefe24f80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7177 10904 bytes
font_02_sfnt_off000096c3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C3 4324 bytes

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