Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6a806906599d4a…

MALICIOUS

PDF

49.2 KB Created: 2020-09-10 07:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e99e6c83ded26b4ff56ea1ccb20b529 SHA-1: 0e00bb443382427801e212eff5c4d8d2c04bd6cc SHA-256: 6a6a806906599d4a5ba182b37c7d3110b1f36d56dde93a1020ed4499c9ecf3fc
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, which is a strong indicator of malicious intent. The document body, though obfuscated, contains a URL that appears to be a lure related to 'Dialogflow google sheet'. The presence of a link farm and the ML classifier's high confidence further support the malicious verdict. The primary attack vector is likely social engineering to trick the user into clicking the malicious link, potentially leading to a drive-by download or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.link/wix?keyword=dialogflow+google+sheet
    • http://nexeguxol.pacmuners.com/uploads/1/3/0/8/130874253/d824a07c505f4ee.pdf
    • http://files.solsticedevelopment.com/uploads/1/3/1/4/131453267/fawokegokepikujubi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/704566_e676d604287446febccef8da514a5224.pdf
    • https://static.usrfiles.com/ugd/e2f197_d016a9fce82b446599213162d56d61a2.pdf
    • https://static.usrfiles.com/ugd/13ae68_c5a934114da24975930f9ddc3e633a73.pdf
    • https://static.usrfiles.com/ugd/d9f7b5_c665d5286d774a7085ebd2b164ae656d.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/jumble_answers_for_today.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/povumad.pdf
    • https://cdn.shopify.com/s/files/1/0463/6380/3803/files/33114706040.pdf
    • https://cdn.shopify.com/s/files/1/0465/1610/9462/files/consumer_reports_used_car_reliability.pdf
    • https://static.usrfiles.com/ugd/b8c837_42eccfa6e4cd4a4082202e7c8a726db6.pdf
    • https://static.usrfiles.com/ugd/61f964_f920ade8229e40b0b77ecb6bfa1a7021.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006002.bin
693070d2e025e80b213da82cca2c568e59929a5e32b73173acb7bb7bd12dbac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6002 4708 bytes
font_01_sfnt_off00007027.bin
194e5d38f07ee9ca171008289ea9829df9f4f99344e486e76f98d5ea8f276e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7027 10288 bytes
font_02_sfnt_off0000938d.bin
119424a8ecf3f1072c2198f043539d7815c23af1e01ce133efc48177564def69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x938D 16336 bytes
font_03_sfnt_off0000a942.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA942 4324 bytes

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