Malicious PDF — malware analysis report

Static analysis result for SHA-256 d483fb829233a230…

MALICIOUS

PDF

691.4 KB Created: 2020-09-12 12:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce7bfb10f97237851f080a5a6f31a9ba SHA-1: 13579483b1975b74444992b3dd8563402ba687e4 SHA-256: d483fb829233a230fdb44cba11896b70a796e3ed2ec673a33964a11d1f6b7f1d
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains an embedded URL that is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the intent is to lure the user to this external resource. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9623

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=the+story+of+my+life%2528+biography+pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/wumosemuwinizaluwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/48764489036.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7192/files/klondike_green_felt.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/95725783629.pdf
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/priority_health_prior_authorization_form_for_medications.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/62912909088.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_b9d338cead614deb91f4691cd25b647c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f98fac90fa214322abfe941517a167fb.pdf
    • https://static.usrfiles.com/ugd/5cd33b_9bff3e6ed3c447c88ab695d7970d7767.pdf
    • https://cdn.shopify.com/s/files/1/0434/4207/7846/files/champion_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0435/3336/9503/files/4658199398.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1660/files/rowupapukowojigakovef.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_off000a8361.bin
5c6b3d078dfe3a18c91ebf4b7281b04b9eff2c02557c14bfe1143d8370c0593e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8361 5724 bytes
font_01_sfnt_off000a96c7.bin
b7eb2d182e227b53103f063b1ac9ade6c3c9581aaee97d8fb21bb271be2fe794		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA96C7 10440 bytes

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