Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b7f5e527fda734…

MALICIOUS

PDF

42.0 KB Created: 2020-07-08 21:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b462ce2e83bce1c3312626a673c9f52 SHA-1: 0b14c221d8023cb995ad0a5f983dd78cba2d1711 SHA-256: 20b7f5e527fda7345906274b2c96e986e774ee7a32a48f77f1474cf39c3e9d8c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to redirect users to malicious sites. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern is the distribution of malicious links via a PDF document.

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.cc/wb?keyword=elicitores%20en%20plantas%20pdf
    • http://files.mrstuckeysclass.com/uploads/1/3/0/7/130776841/4143467.pdf
    • http://files.theolycenter.org/uploads/1/3/1/6/131607269/2c515d56b.pdf
    • http://files.thatdogplaceltd.com/uploads/1/3/1/3/131398357/budodibobu.pdf
    • http://files.jancancan.com/uploads/1/3/1/4/131406413/sosazidisajawaj-ledosol-vaxodavuv-ziwobedomanefon.pdf
    • http://files.lincolnfencecontractors.com/uploads/1/3/2/6/132681938/7c5f525598fb.pdf
    • http://files.elcorazon.net.au/uploads/1/3/1/6/131636737/7982255.pdf
    • http://files.reevespeanutcompany.com/uploads/1/3/1/4/131406835/murijefinijisep.pdf
    • http://files.stregoniband.com/uploads/1/3/0/9/130969301/6043214.pdf
    • https://xawuwoliv.files.wordpress.com/2020/07/fetotozovukijezibaxe.pdf
    • https://tunokidi.files.wordpress.com/2020/07/xakamulovemilim.pdf
    • https://gosorazolug.files.wordpress.com/2020/07/80927383073.pdf
    • https://tamanalewoja.files.wordpress.com/2020/06/tinivexapudopidaxobiniva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.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://cdn.shopify.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006424.bin
c31aaab091affbbe69da1fc37d8e334ad74b9bde4de725c1f521a95f868b5f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6424 4896 bytes
font_01_sfnt_off000074c9.bin
bfaaf325bff41d117908cc62f51e7925985f024ae9c5401e242c6e84888ad5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C9 11440 bytes

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