Malicious PDF — malware analysis report

Static analysis result for SHA-256 041ccf0d3ff24ff7…

MALICIOUS

PDF

41.9 KB Created: 2020-08-26 13:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e4f25d1faab504b289ccefb94e0f0aa SHA-1: 6ebc0876f7c1e1b870c89ce536779d66aaf968e2 SHA-256: 041ccf0d3ff24ff780067ba569b3f3cb92c753b2223c903f80a83633c1edf61f
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 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm or content distribution network being leveraged for malicious purposes. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=young+thug+jeffery+mp3
    • http://fopoju.flowersfromsarahsgarden.com/uploads/1/3/0/7/130739892/vopemuvofe.pdf
    • http://files.personalbaggagestyle.com/uploads/1/3/1/8/131856392/40cd0dfabbd9.pdf
    • http://files.meghanfialkoff.net/uploads/1/3/1/6/131608037/mugusutirob_lewuxufa_tewafe.pdf
    • http://files.bankercuin.com/uploads/1/3/0/8/130874304/04a7262656.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/mawupibogidixixorin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4478/1735/files/97864738006.pdf
    • https://cdn.shopify.com/s/files/1/0440/6929/0149/files/risudupemabijo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/6074830511.pdf
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/40123549261.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/gekililebiwixupexomed.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/2482003406.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/av_fistula_complications.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/77892455333.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5749/files/accountant_responsibilities_resume.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/52537702202.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_off00004cb5.bin
071cb2e18a6cab8cc97edef37895be6953262157c68074202dc8b58b4f8732d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB5 5032 bytes
font_01_sfnt_off00005dc7.bin
dfbe77615286146c1ffde5f6b816dc0b5c69df49a121b8fba353570a11e4961a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC7 15100 bytes
font_02_sfnt_off00008cdc.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDC 4324 bytes

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