Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bac3474830a46f…

MALICIOUS

PDF

47.5 KB Created: 2020-08-10 18:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb9a5cc470f5bc92052f43bb2126a62c SHA-1: 70ce4f5a18e774079dbca4cbf27a587b9d2b0a4d SHA-256: b0bac3474830a46f418512ffa3d8cf5d29767bafe5aa2a56563d5926404b8f18
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at ttraff.ru, which is disguised as a "9th class English textbook pdf". The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector indicates an attempt to lead the user to a harmful site, likely for further exploitation or credential harvesting.

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.ru/pify?keyword=ts+9th+class+english+textbook+pdf
    • http://gunux.cookdbyh.com/uploads/1/3/1/4/131483200/welabemujozojike.pdf
    • http://files.elderflowerstudios.com/uploads/1/3/1/4/131453124/xopagamepana.pdf
    • http://files.bringsnacks.net/uploads/1/3/1/3/131384636/f91ef6b6539.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/23885245220.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/54453355520.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/citizen_gn-_4w-_s.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/hdfc_bank_loan_against_property_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/8458/5883/files/tennessee_comprehensive_driver_license_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/27259656983.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/les_articles_partitifs_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/kepekiba.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/fonenepuronusobijadezaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/81096773262.pdf
    • https://cdn.shopify.com/s/files/1/0437/5163/7141/files/36803211377.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/metugesarir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/transporter_the_series.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c23.bin
e8396d7407675c3971297c16f71bc4c04d452977c72db774aac93305f418a9b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C23 5484 bytes
font_01_sfnt_off00006eaf.bin
f744d6fba26f820e4a443fc45911177c264a6ea2c72ea480764417b6e462b341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 5600 bytes
font_02_sfnt_off000080bc.bin
0045ecd95a3115bbd5f3cd588062e1d979904626c668c9c3dc222e5a56aea0f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BC 9960 bytes
font_03_sfnt_off0000a29d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA29D 4324 bytes

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