Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9b65bf8a12d76…

MALICIOUS

PDF

52.9 KB Created: 2020-10-25 22:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f8905382a99810368d86269038f53f8e SHA-1: c2821df90a1af440503eebf8d2b67df1ab395348 SHA-256: 79c9b65bf8a12d76a35b3a8838d25d7cdb57f12248fb556c0b534d490c22ba37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, suggesting a lure for users searching for specific manuals. The presence of numerous links points towards an SEO manipulation or phishing campaign.

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.me/123?keyword=ingersoll+rand+diesel+air+compressor+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f88cda0b7f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f88d94ea007f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f93cce9b69a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5f924be45f195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5f9426a4da0c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f8a4e67a7705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f8712316a600.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/kovunikol.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/zojenokemaxow.pdfIn PDF document text
    • https://vakasuvarepem.weebly.com/uploads/1/3/4/3/134328097/lafopano_fezig.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/8037be8d9f902.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/divejuxofepuwori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f88d1027e56a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f8acc1555b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5f93137fa0beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f87fe724381a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8a9ae79e5df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f8edd193fd1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f8a1decea4bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f920aca54cf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f8b3a47e742a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f87d47f33615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7612/7394/files/fedefidokak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/32288489624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6050/1921/files/fivoxajewipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0980/4960/files/mudadopok.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC3 5328 bytes
SHA-256: ace5ff3ce5323b4fdda609d0c15ef78bf0afa745a298a84871f583b407816f93
font_01_sfnt_off0000a0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C3 10972 bytes
SHA-256: ba956e32eef88a94a165deabcee8cf87d5642be29e078f1917d6565ca1dbadc8

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