Malicious PDF — malware analysis report

Static analysis result for SHA-256 3441865935dc38da…

MALICIOUS

PDF

35.0 KB Created: 2020-08-05 12:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8051e83a70caa8a90009e0fa6af5668c SHA-1: 96c45bd1f030906e23de6b4604d522ea28b0b9d6 SHA-256: 3441865935dc38daf3fdbfd94d9c55fab3c075b9f96cadf69ac6b6806cd58870
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=c+a+f+syllabus+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the redirector suggest an attempt to lead the user to a malicious site, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.com/pify?keyword=c+a+f+syllabus+pdf
    • http://files.bandbrealestatedevelopment.com/uploads/1/3/1/6/131637072/2272610.pdf
    • http://files.katharoscatering2go.com/uploads/1/3/1/3/131380504/naxejole.pdf
    • http://files.ajcaptured.com/uploads/1/3/2/7/132740485/613fdde3a588db0.pdf
    • http://files.asmalltownbakerycafe.com/uploads/1/3/0/8/130874162/litudafopabofidav.pdf
    • http://files.zeldaknapp.com/uploads/1/3/1/4/131438557/mutoteri-jerun-lidibomabewew-nowalufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/best_reader_app_for_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0438/0003/5485/files/95037512601.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/7909145092.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8448/files/lapepaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/51608900237.pdf
    • https://cdn.shopify.com/s/files/1/0436/5172/7513/files/96086220316.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/86473442675.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/68974257361.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/leatherworking_guide_ffxiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/1234/8315/files/catalogo_hinode_ciclo_1_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2678/files/kusajuxosilusuwolojis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a66.bin
498242cb1871b9b6d7ba57690831a0929d5c88ee0d18c31dbd1c8321d50481db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A66 5084 bytes
font_01_sfnt_off00005bc7.bin
396d67f5927d67936d75ad72e7c0c89152d012bbae390f025c9317a05d4545f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC7 10420 bytes

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