Malicious PDF — malware analysis report

Static analysis result for SHA-256 16391cce08d1d262…

MALICIOUS

PDF

37.9 KB Created: 2020-10-30 12:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: b5d6b656854cb1728d6edea274493e5f SHA-1: 8a9ece30abba424269926246f439c24e00888a17 SHA-256: 16391cce08d1d26266bc6eb5467bdb992433ef2d1043f228cc2930e672ade8ad
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to numerous external websites. One of the embedded URLs, https://cctraff.ru/aws?keyword=nathan+and+nathan+pc+birmingham+alabama, is identified as a malicious redirector. The document's structure and the presence of a malicious redirector suggest an attempt to lead users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/aws?keyword=nathan+and+nathan+pc+birmingham+alabama In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5f94cdfc4a863.pdfIn PDF document text
    • https://vurazomuloja.weebly.com/uploads/1/3/4/3/134322302/pixev_papovedavezokif_titubu_fadedagimalugow.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/0f5da78a5f130b.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/adb07038f.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/8176664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fdfb80e9-c6b1-47ed-93e8-f50d8255b8e3/black_and_decker_18v_battery_charger_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2812/3295/files/uniondale_library_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4073/2851/files/arcane_archer_build_pathfinder_kingmaker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2948/6505/files/practice_and_homework_lesson_7.2_answers_1st_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48A2 4980 bytes
SHA-256: 22e31a838fe55c70ce8af8585d777369e6ed4639bbe561dd592226429bcec31e
font_01_sfnt_off0000594e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x594E 10288 bytes
SHA-256: deddc7778cbb4ecfcf7b399bb648247b075f3e779bf44ddfdbeb686b4c3b3350
font_02_sfnt_off00007c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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