Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f627438c60bd2ee…

MALICIOUS

PDF

57.8 KB Created: 2020-09-02 17:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a41bc98810f41b8a552b9487c175d9 SHA-1: 4247773cb2ddedef2428981cdf70979e6f868a16 SHA-256: 4f627438c60bd2eee1115999187bdc22380d2adc51bef051437e607e6971053c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.me, which is disguised as a "Mckinsey cover letter template". The file also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive document title and a malicious URL.

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.me/wix?keyword=mckinsey+cover+letter+template
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/bumerenowepanifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11411440246.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/systems_understanding_aid_8th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4137/files/aadat_ninja_free.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_6d20f2e8a65c4a689d7b2ddcb4575f5f.pdf
    • https://static.usrfiles.com/ugd/57c819_a2bc3ba5781f4b36b93b5fad0bcd394c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d95d3d4b9e01494e8114e06dbf95f1fe.pdf
    • https://static.usrfiles.com/ugd/0789d5_b9f178d0494743e79a02d6b662be7fa6.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_8f450129d1e44330a3338f00ee45942b.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/48915632148.pdf
    • https://cdn.shopify.com/s/files/1/0433/4803/3689/files/gigezotitase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/rifiwivekiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3967/8886/files/45111799557.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/47180275289.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/free_phonics_worksheets_for_year_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/zoloto_butterfly_valves_price_list_2020.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/
    • https://static.usrfiles.com/ugd/57c819_a

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a2e5.bin
07d8a4e38bb08df0c2b36ae08d45c8ec7f88deab2137bc73b2c8cf93830f6d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E5 5312 bytes
font_01_sfnt_off0000b4fc.bin
c6cd07f6c59b593ce696d5111c4479c51613556c5ea3443b880c802745a3ea3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 10864 bytes

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