Malicious PDF — malware analysis report

Static analysis result for SHA-256 013ad43424481534…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 17:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54f07bca59620250d621e7ceb0851ac5 SHA-1: a9e86fa7ac1f0fcdb22663decbc945d20e056582 SHA-256: 013ad434244815348e9507a479421499366a07be8a8d33f4420463ff8d5d6216
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a malicious redirector link and a mass external PDF link farm, indicating a social engineering attempt to lead the user to harmful content. The document body and heuristics suggest lures for browser extension installation or callback phishing, aiming to trick the user into executing further malicious actions. The ML classifier strongly flagged this PDF as malicious.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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=google+chrome+ti%25E1%25BA%25BFng+vi%25C3%25AAt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3ceeb9_2851832663034a95b5eb71526aa34085.pdf
    • https://static.usrfiles.com/ugd/b7ed05_f707e157754244ed88b6854f6d55431b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a15e2bb99a464cf48c44de4e05ca7842.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9bbb2f37b8c4450a50a5e3427f115dc.pdf
    • https://static.usrfiles.com/ugd/80c1db_5dd0eebb2b3a44909661e9cc65d4331b.pdf
    • https://static.usrfiles.com/ugd/7baf93_8a938f602a484e77b8b7da53a5e869de.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_7047faee26d44d0e91365219168c5ae3.pdf
    • https://static.usrfiles.com/ugd/f65175_4b991bb4059a48228e8e16dfd608c6e5.pdf
    • https://static.usrfiles.com/ugd/1e4819_d5ce1d27753c4f55b8ec07fbdc44c0f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b41ed9564edc49e481e31d1d9dac9b30.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/pinitujizefajeze.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2054/files/1998_c280_manual.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_off0000651d.bin
b244f4af6c44a9a3d1e3e717234a008e140f047fe9d7768b54e86b913e2f02c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651D 5236 bytes
font_01_sfnt_off00007631.bin
a892f7e7ed5bc61dffb25127abcf1261e368c42589a654192141b9efddaffc6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 11724 bytes

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