Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9c672b1e35db51…

MALICIOUS

PDF

41.7 KB Created: 2020-10-04 11:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 54f7df31ba2f3eecefdc4f2c714b50f1 SHA-1: bf8d73f9ee9bad3b3f0b6ef53c97bc644ba62e8a SHA-256: 5d9c672b1e35db512746b92412a4aa90298f701b10b9b1b9593ba200e8d355ec
192 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, and a critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for cracked Android applications. The presence of numerous PDF links suggests a link farm designed to distribute malicious content or traffic.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/pify?keyword=android+cracked+apk In PDF document text
    • http://files.emeryjewelzshop.com/uploads/1/3/1/6/131606367/9441720.pdfIn PDF document text
    • http://files.activeperformchiro.com/uploads/1/3/2/7/132740723/2ba2681.pdfIn PDF document text
    • http://ruriwebag.drlouiefrodriguez.com/uploads/1/3/0/9/130969407/kazisejojogibam_nuzumo_lidabotubamo.pdfIn PDF document text
    • http://files.aliceannephotography.com/uploads/1/3/1/3/131379447/xisejexopore.pdfIn PDF document text
    • http://files.wicknsudsbydino.com/uploads/1/3/1/8/131872042/noxovuwinedoxu-salexevulil.pdfIn PDF document text
    • http://files.blackhavenranch.com/uploads/1/3/0/7/130739081/6864073.pdfIn PDF document text
    • http://wizapizo.snamuts.com/uploads/1/3/0/7/130775883/4113393.pdfIn PDF document text
    • http://files.mertech.co.uk/uploads/1/3/1/1/131164129/tusix.pdfIn PDF document text
    • https://site-1036692.mozfiles.com/files/1036692/26041027619.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/94393167601.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/83149395294.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/fowokepixebepotaliwo.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/1/0484/6724/7258/files/38162191978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0860/5590/files/simple_batch_system_in_operating_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1164/3304/files/rotoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2498/5497/files/wow_3.3.5_assassination_rogue_pvp_guide.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_off0000649b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649B 4912 bytes
SHA-256: ccffe9374d1dcf7d2859122b50a723dd770046befd1c3f7e4d0e953364072fa7
font_01_sfnt_off00007563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7563 10636 bytes
SHA-256: cdda994ad0b451a76eb65860a049d5b8e0a5c24d147a9a45f5ff11790a424864

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