Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bf0ce2c14386ef…

MALICIOUS

PDF

98.1 KB Created: 2020-10-28 08:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a2666880f607d762c6ab7dd14cb1667c SHA-1: 1a6b71c34f003e9f193bce20b8bd2750165c1d66 SHA-256: b1bf0ce2c14386ef7a57e7826f6d8e252f785d1f6615e5d85a2b312b0a4b8d31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure. The presence of a link farm further supports this, indicating an attempt to generate traffic or distribute content through multiple external resources. The ML classifier also 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.cc/123?keyword=bear+totem+barbarian+build In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f93cce9b69a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f872ce73fa29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f954a6c0d344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5f98e290c112a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5f8caa4872e87.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/1/0437/8260/2904/files/zaxapuzisil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9476/0387/files/1864871268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7892/9569/files/fitemefoxosujovagonok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9780/9830/files/43383055892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2621/6635/files/pifunenamejobip.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/zemogilesiruza.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/wowelinikodabavibegedebu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/charlie_brown_christmas_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/angina_pektoris_tidak_stabil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6515/5487/files/91740270473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2360/5153/files/82541659079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0799/0184/files/prefixes_worksheets_for_grade_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5282/6777/files/quran_pak_para_1_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/91578017429.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6681/7182/files/nororarinuzesijutinejixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/xekesonezaripo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0314/9479/files/pan_edit_application.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_off000142b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B9 4984 bytes
SHA-256: ad4b9e738b40515f0ed4643efd5a0c82172a68dc194b5ab4095c3c74139b4f26
font_01_sfnt_off00015386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15386 11348 bytes
SHA-256: 300e19982b20ab90ac7b3c0d288979129e8f986aef8fa72ff60e9273378fc9ae

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