Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8dd0435a9b5b1e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 08:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76c7cc78988e79372946ff7d62143614 SHA-1: b9f484e01e0e5a55174bb6b21bf089c848f317be SHA-256: 5b8dd0435a9b5b1e62bd3b587402428b84d1ec893c97bb3da3394a2fcf6fd433
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain. The heuristic firings indicate this is a malicious redirector and part of a link farm, likely intended to distribute malware or phish users. The document body itself is heavily obfuscated, but the presence of the malicious URL and the link farm strategy strongly suggest a malicious intent to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=altiplano+mexicano+pdf
    • http://files.figman.com/uploads/1/3/1/1/131164016/lubowozuku.pdf
    • http://files.thinkinenglish.org/uploads/1/3/1/4/131406811/kifivegipifalas-sesanefafu.pdf
    • http://files.suabhyankar.com/uploads/1/3/0/7/130740514/9016030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/arabic_calligraphy_art.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/35601959130.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/sovorosexonasepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/gujefesexewapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/soxevebusutiviladefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/77417100930.pdf
    • https://cdn.shopify.com/s/files/1/0431/0407/5933/files/vawinilojudaruvetudireva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55079075607.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/tutumo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/napufodux.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/73520422928.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/fibonacci_sequence_formula.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006334.bin
be733f79aab90e5dc34d29ec03204d9fabdd344bd80da9a817ae1cef9be71af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6334 5084 bytes
font_01_sfnt_off00007478.bin
0c854ca5b746dcba3ff1cfd47a93a3ac2728014ddaff1513a0bf4563a364360b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7478 10996 bytes

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