Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8ddd5898fa46a0…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 14:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d497fe30857db0e8efadadb0e55ca1d SHA-1: 6504f9371ad9f18abe924c2c2eeec19fca3720d4 SHA-256: 4b8ddd5898fa46a0a897a4756db466b189e33a5672db47bb24d36ca34079b6a2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to a link farm hosted on Shopify, designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.cc/wix?keyword=how+to+unpin+post+on+facebook, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/wix?keyword=how+to+unpin+post+on+facebook
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/97308800109.pdf
    • https://cdn.shopify.com/s/files/1/0450/8103/4917/files/usb_burning_tool.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/digestion_absorcion_y_metabolismo_de_lipidos.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/deep_learning_applications.pdf
    • https://static.usrfiles.com/ugd/d162e3_7d3f375b949f4a179b6ec68220ab3b60.pdf
    • https://static.usrfiles.com/ugd/4479ed_af919e52bb4e4e4c8e3cd7640b1558ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd6b989234fb4b62b9efc3dbff31a08e.pdf
    • https://static.usrfiles.com/ugd/b8c837_38a188c40265452cab616fb50c033f7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_088496f877554fc7baa16a55277a884e.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/41857389550.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9378/files/xusozelowedujumezudutu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7034/files/95599499267.pdf
    • https://cdn.shopify.com/s/files/1/0440/0221/4046/files/bejimirapoxes.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c41bea29aba489cbd092bdc608078f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2b54085ec3641cf92a9321c5c3a165d.pdf
    • https://static.usrfiles.com/ugd/299074_fce5f9a2921b4225b970ff2000f3cb30.pdf
    • https://static.usrfiles.com/ugd/b8c837_84efde7250314dec8f068c642ff89482.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_f296c7f2360545c78a2a8a9552b6f49c.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f6b.bin
7b93b0ea1ff688e1d5c1c22b66ef6c72dd9dd97144e33a4ba63b2b5c658e9efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6B 5140 bytes
font_01_sfnt_off0000710b.bin
c5fbed76d8d110b81ff5bb09087f20575494fa1c7998562b48ed9bc5db0cf70f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710B 9900 bytes

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