Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eb4dc334256391…

MALICIOUS

PDF

45.2 KB Created: 2020-08-21 04:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 065b42448d63adf4932e1c074b53986a SHA-1: 40354842a397f23e92c326abbf4a968f090889aa SHA-256: 78eb4dc3342563917a2bc2f56b6bf28eaf0b31c826f0169991864e5c81281273
194 Risk Score

Malware Insights

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

The PDF contains a link disguised as a Windows 10 Enterprise ISO download, which redirects to a known malicious domain. The 'SE_CLICKFIX' heuristic indicates social engineering to trick the user into executing commands, and the ML classifier strongly suggests maliciousness. The document body contains obfuscated text and embedded URLs, including the primary malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/pify?keyword=windows+10+enterprise+iso+msdn
    • http://files.dunedinhempcompany.com/uploads/1/3/0/8/130814411/555859.pdf
    • http://files.acfields.com/uploads/1/3/2/6/132681916/wekovaxonab-folara-mebokek-vokaxibimag.pdf
    • http://files.keppelcoastcameraclub.com/uploads/1/3/2/7/132712358/9966697.pdf
    • http://lesux.fairmounthillcf.org/uploads/1/3/1/4/131453284/ruvejosirekoselajor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4166/6710/files/safusivipokesamuwadopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/21213582092.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/student_learning_objectives.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/socialismo_y_capitalismo_libros.pdf
    • https://cdn.shopify.com/s/files/1/0428/7702/6463/files/vumiwixudavadiwiba.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2199/files/fegelovazogebivejoti.pdf
    • https://cdn.shopify.com/s/files/1/0432/9039/4788/files/http_ap._netis._cc.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/treatment_guidelines_for_social_anxiety_disorder.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/30650583494.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/keritegepebibif.pdf
    • https://cdn.shopify.com/s/files/1/0460/3923/6767/files/bag_making_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/pronoun_antecedent_agreement_worksheet_doc.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/74538569494.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_off00006ba7.bin
2e0a0275f4f6c48a0b67b4fd70b357b83f4160832a0a80276f3bcdf4f415855c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA7 5164 bytes
font_01_sfnt_off00007d3a.bin
e48c24ae435b58ceeac897799e576347c127a776ddacc16613194b66b44b7d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3A 13440 bytes

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