Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cd9f2dc12f2036…

MALICIOUS

PDF

39.6 KB Created: 2020-08-13 16:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 940f29b731d06102040ad41b051147e6 SHA-1: 9147abfc098bf6a3664e8c2fff75d3c9e10366cd SHA-256: 63cd9f2dc12f2036293a64566c978f71878777966a6451693b1863b2b4d2dea2
162 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 to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to download content. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.
  • 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.com/pify?keyword=past+simple+and+past+progressive+exercises+pdf+with+answers
    • http://files.coasttocoasthauoratrust.com/uploads/1/3/1/1/131164075/bc3618eaa.pdf
    • http://files.counsellingpsychologist.services/uploads/1/3/0/9/130969555/7582248.pdf
    • http://files.heartlandracingco.com/uploads/1/3/1/4/131483830/40dd82045.pdf
    • http://files.beach24h.com/uploads/1/3/1/4/131438231/2426349.pdf
    • http://files.mmqualitycreations.com/uploads/1/3/1/4/131437363/d6050979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0783/5292/files/business_card_design_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/tobetuves.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/importance_of_balance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2310/files/bankruptcy_act_malaysia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/57299011341.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/guziwekuda.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/lexuwibavegekiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9942/files/65535163714.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/apa_style_research_paper_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/1916/4058/files/neural_network_cost_function.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/xunefuviwebabumilisetefud.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/17050656007.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/git_push-_set-_upstream_origin_master.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_off00005a29.bin
175388760109de9d963e25de84dd70db1b449805a8480318c6653d879ecf250a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A29 5792 bytes
font_01_sfnt_off00006dc3.bin
22b661a4bed5fa6977fa7925176d072b8e5814edc27050855c87e6414caa609f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC3 10384 bytes

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