Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db77b8ffa0a69c3…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 06:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 137b2c45766a051804e6bd14b7fcd8f9 SHA-1: 98146d32ba37066dabcbd75c0293234e152e6191 SHA-256: 5db77b8ffa0a69c3f1a4cc281c97dddf44e4320ce06468588918f404d3eb872f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, masquerading as a search result for educational material. The ML classifier strongly indicated maliciousness, and the presence of a redirector link suggests an attempt to download a second-stage payload or phish for credentials. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=glencoe+biology+textbook+pdf+answer+key
    • http://files.vpgal.com/uploads/1/3/0/7/130775429/1865793.pdf
    • http://lazusome.vivotrainingsystems.com/uploads/1/3/1/3/131398560/kixali.pdf
    • http://files.designsbydinius.com/uploads/1/3/1/0/131069781/6822757.pdf
    • http://files.brownsvilleumc.com/uploads/1/3/1/8/131871424/lorafojunopux-kapef-lidusamabol.pdf
    • http://files.cjstuf.org/uploads/1/3/0/7/130775679/9910796.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5269/4680/files/94844372879.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/22607543943.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/wogupog.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/23381364630.pdf
    • https://cdn.shopify.com/s/files/1/0439/4650/8456/files/alcohol_dependence_syndrome_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/kebede.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/37340145305.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7717/files/tomivonalibewobipixuzoro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/xufikeliwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/48604726455.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/tegozopuriwinojixok.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_off00005888.bin
194c552afd455937606a1291867e98f9057b682afb6402f188238e6e1b0caf43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5888 5820 bytes
font_01_sfnt_off00006c8d.bin
03f815e2b45cf7f93ffbf229ecd2d6fa00203a2cf6bc5e1a4a6d35d5a20016fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8D 13100 bytes

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