Malicious PDF — malware analysis report

Static analysis result for SHA-256 861cca51067724b3…

MALICIOUS

PDF

42.9 KB Created: 2020-08-30 19:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7130c6b8ced420f9226a35e2a7cad337 SHA-1: f2a20ccca2e3f8e8826d30a10266be79afce13af SHA-256: 861cca51067724b362976865c7efd0322e4d9ddc046975ef9d0e4c4816a5bb4a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominently leading to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'solutions pdf' for an engineering textbook, likely a lure. The presence of many external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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/wix?keyword=aerodynamics+for+engineering+students+solutions+pdf
    • https://digitalcontentmarket.org/wp-content/uploads/2018/01/Solutions-Manual-Aerodynami
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_71eaf389f3d94dfd8354dcb8484d49b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e9be0217a2c438ca5ca0ecfe9722218.pdf
    • https://static.usrfiles.com/ugd/b8c837_58698c06fa6840518f5369d122e9ed50.pdf
    • https://static.usrfiles.com/ugd/575363_833ba8e5b10142f89cf91312f9e7d33f.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c56ff02bb8747a39c6d409075c3bdb5.pdf
    • https://static.usrfiles.com/ugd/eb6612_7541bd73b63b4265b9b7ef41eb896c09.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dac6d33d23745beac1c2bc26ccdf979.pdf
    • https://static.usrfiles.com/ugd/b8c837_b15b48bc05bb442585c42e9101cdf8a4.pdf
    • https://static.usrfiles.com/ugd/353d00_d5523c0096524b008d61fcbf894cb7c1.pdf
    • https://static.usrfiles.com/ugd/c1108c_aec4b81e29624824a6f009e7b6726a1f.pdf
    • https://static.usrfiles.com/ugd/99965f_9b250911c3684efdbe8e221ba789cc93.pdf
    • https://static.usrfiles.com/ugd/b8c837_047b736365034e24a6aa527cd62a058b.pdf
    • https://static.usrfiles.com/ugd/40512e_d65192d486a34aeb9d8663b9b8493d86.pdf
    • https://static.usrfiles.com/ugd/55f640_4f3f756b981d48e6b8369e59729a7bd0.pdf
    • https://static.usrfiles.com/ugd/0511f5_fcd014ce75274453b873a2911d2398c0.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_off00005a9f.bin
4da5dc7fee73919966eb612941675cdf21f0ec91e67712fbcb062c0300e15058		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9F 5448 bytes
font_01_sfnt_off00006d19.bin
b46a8a267ef99e4fbd5a70194bc6f526d3b98b9dcb5f9c8406f3a851d159570c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D19 10240 bytes
font_02_sfnt_off00009024.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9024 4324 bytes

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