Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b01c129f39a3792…

MALICIOUS

PDF

37.8 KB Created: 2020-08-22 17:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 352a37d43d9f4a562775c3b432df8d43 SHA-1: 509ef4f50839d7cc38c5c1f5367e4938c861bebd SHA-256: 1b01c129f39a3792e15dbe409ee8b7f8ea24bd09c44dff186db71b7e9c2b49a8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning attack designed to lure users to malicious content. The document body contains text related to academic information, likely to make the malicious links appear more legitimate. The ML classifier strongly indicated maliciousness.

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=faisalabad+board+9th+class+date+sheet+2019
    • http://kemiboso.keepcalmandreadon.org/uploads/1/3/1/4/131405927/famajuzapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/23095766856.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4166/files/wumipuvejomokepitosim.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/lisukuvasud.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/guwamesafaxiwaze.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/womojovufipamuloxas.pdf
    • https://cdn.shopify.com/s/files/1/0465/0087/2344/files/consumer_reports_canada_all_season_tires.pdf
    • https://cdn.shopify.com/s/files/1/0430/0213/4681/files/datation_carbone_14_exercice_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9507/1651/files/guide_words_worksheets_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0448/2659/1389/files/angular_formgroup_formcontrol_valuechanges.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055d9.bin
b4e11ab281b4bf7c8d50597f84511efb201647431edeb0c6465e3dc4ea44c2f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D9 5604 bytes
font_01_sfnt_off000068d1.bin
599c77bbea8f896f63d2703c556a33cb76c3efdcc421408545c572f6734672e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D1 9832 bytes

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