Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdffd1c6d0feb027…

MALICIOUS

PDF

65.0 KB Created: 2020-12-16 05:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a694427d23a64feda13487efce4303b5 SHA-1: 83267b9e189ec8180e2499c24f858d379ac338e7 SHA-256: bdffd1c6d0feb0276452213b3374bf9723f1beac37f4a66b635872e9e33944de
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a significant number pointing to a link farm hosted on strikinglyn.com. One of the primary external URIs, 'https://traffine.ru/strik?utm_term=you+make+me+happy+when+skies+are+gray+svg', is flagged as suspicious. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/strik?utm_term=you+make+me+happy+when+skies+are+gray+svg PDF link annotation
    • https://mufudoxideli.weebly.com/uploads/1/3/4/5/134508761/d7a3a3ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_5fb6ca96ebe7d.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/fisomileboxoke.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/01c6b.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/1494895.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/4640b1a8-f6be-4fb6-8482-cfec2a6f5a1c/95624846450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cfecbd-9d4b-4aca-84d7-a6455cbc06e1/free_light_leaks_overlays_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756f0872-ae75-4c94-8511-55249edc85fa/savage_in_limbo_monologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa44bfe1-a8d6-4286-aea8-6a5c4f248e5c/fumomokewofexem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc76daf3-8313-4ee4-b663-38e4f5c7cfce/tegis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc524abd-47ee-4e0a-ac0e-1a24bb2c0f41/xivobifibigabi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce6fa92088997336171c3a/t/5fd670d87fc52c20692682ef/1607889112348/99430713729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f2a4dc-f228-4414-964d-6a226e10c314/17491763513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44db3ed4-6faa-4ddc-98eb-e5ec1630ba1d/d3dx9_26.dll_que_falta_need_for_spee.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_off0000b291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB291 5280 bytes
SHA-256: 1cde171f7601b25f01f98315f4bd8e8f253e61eb3ee459a0f80958f35a993da0
font_01_sfnt_off0000c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 10668 bytes
SHA-256: f9e2f094c1801790fb21976df074f3467e0dceed8865918d8af53c29f7744b6f
font_02_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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