Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a88fd1c4683805…

MALICIOUS

PDF

48.9 KB Created: 2020-08-18 20:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b5e25fcfa201a5b8f4ea5c9e69ebc58 SHA-1: c52879106b273e83074bf2dd907e0c59f65cbb28 SHA-256: 50a88fd1c468380523139a55f11a7a9732a41e82e318837fa4df75977c906058
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though partially corrupted, suggests a lure related to educational worksheets. The heuristic firings indicate a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content through a chain of redirects. The primary malicious URL identified is https://ttraff.cc/pify?keyword=factorising+single+brackets+worksheet+ks3.

Heuristics 3

  • 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.
  • 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/pify?keyword=factorising+single+brackets+worksheet+ks3
    • http://luxela.momentsofgracewithmargaret.com/uploads/1/3/1/3/131379578/relebije.pdf
    • http://deluruw.qutmess.com/uploads/1/3/1/3/131398134/94053.pdf
    • http://files.mcmillanvetclinic.com/uploads/1/3/1/4/131410370/356316.pdf
    • http://didozuvor.tajpalacelouisville.com/uploads/1/3/1/4/131406437/kagifanibowiw.pdf
    • http://pelego.motley-arts.com/uploads/1/3/1/3/131379594/2662364.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8001/files/50330058021.pdf
    • https://cdn.shopify.com/s/files/1/0448/9166/8647/files/83895933064.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/planet_rock_hours.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/ayushman_bharat_hospital_list_surat.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/93505715977.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/zakizejeliruwajufulozawis.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5464/files/federal_reserve_balance_sheet_normalization_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7360/files/lufolalopowunotapus.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/80208656830.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/94396277403.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_off00007a52.bin
6e6a75664d71bde216900a522375f040000a50554c36f7c462e525c6fd599ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A52 5476 bytes
font_01_sfnt_off00008cff.bin
05381d1b4845790ddd805899fe17e63633a1a432c48a5cd4df717c09240980bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFF 13288 bytes

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