Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea4c266b3b62438…

MALICIOUS

PDF

36.9 KB Created: 2020-08-27 21:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39992695d195cb2abe3606ffcc57301f SHA-1: 4678b4cc9c2fc36ff8d268926ddb5e32db07f400 SHA-256: 5ea4c266b3b624388947d4ca7ed8cbc613f88ca9f80677a99d4cf2b9d98465e6
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Tampering

This PDF document contains numerous links, including one pointing to a known malicious redirector, masquerading as a free software download. The document also contains an explicit instruction to disable security software, indicating a clear intent to bypass defenses. 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=corel+videostudio+pro+x9+free+download+full+version
    • http://files.nevereverdull.com/uploads/1/3/0/7/130776130/bosekodarep.pdf
    • http://files.faithcheraw.org/uploads/1/3/1/8/131871642/gowadifewojewet_tojuzolupamex_kidevusej.pdf
    • http://files.creativesolutionscounseling4kids.com/uploads/1/3/1/0/131070618/fuzizutujasoma-gikekujunar-garejozuvojos-jomuvo.pdf
    • http://files.vonderhauswulfgermanshepherd.com/uploads/1/3/0/8/130813797/fivepeno.pdf
    • http://kudix.kofc6065.org/uploads/1/3/0/9/130969060/8f8d136730dd40a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/tafef.pdf
    • https://cdn.shopify.com/s/files/1/0439/6810/2558/files/bizaxojidojimutivetur.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/android_graphics_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0582/8520/files/wosari.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/pesitinetivajegaper.pdf
    • https://cdn.shopify.com/s/files/1/0452/0479/9639/files/cisco_catalyst_9000_platform_stackwise_virtual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/girerusebepodeki.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2584/files/zezoxobanavowidovumiv.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_off00005158.bin
3437898e35ba0b75d767d24b95f4a4dac28da9080e3c46955e0a51e6822f6aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5158 5316 bytes
font_01_sfnt_off00006392.bin
e7249b64bc591137cf51b33f98b2738e70b6d1fc2b797dc8981c7ce1376b2dcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 10308 bytes

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