Malicious PDF — malware analysis report

Static analysis result for SHA-256 9007bb5968626798…

MALICIOUS

PDF

33.4 KB Created: 2020-08-03 02:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18fed6ca8bc9a752c7770dcff5d08982 SHA-1: dc8f022811a149d302d8e1814dfa922a8583f530 SHA-256: 9007bb596862679847b0d1709209ca700994234f90a91beb7c9f148c8e7e72d5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'Playboy magazine free pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to potentially malicious content. The presence of a link farm and a redirector indicates an attempt to drive traffic to potentially harmful sites.

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=playboy+magazine+free+pdf
    • http://files.kilduffmachine.com/uploads/1/3/0/8/130813601/supilomijodarewafo.pdf
    • http://files.townofpackwaukee.org/uploads/1/3/1/3/131382395/kirojonebetib.pdf
    • http://files.shilohchristianband.com/uploads/1/3/1/0/131069766/wivadote.pdf
    • http://files.ssndesigns.com/uploads/1/3/2/8/132814680/duwuzenazisowug.pdf
    • http://files.nonamemotorsports.com/uploads/1/3/2/3/132303081/kugape.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/85564984349.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5831/files/pepevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/tuziviguloxepidu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8863/files/bates_clinical_examination.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/teacher_evaluation_template_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/lajirajugizuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49470024852.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9221/files/tibuveza.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/navojane.pdf
    • https://cdn.shopify.com/s/files/1/0439/2275/1643/files/jodusagebaloni.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2804/files/jotumorisososulizowud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/lakanurepubigemakofu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000463c.bin
5d0d7a41bb1cedf6e1c9ab1429f0126c128e97ef4cf0c1df6ab4c3ec9d93a1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x463C 5476 bytes
font_01_sfnt_off000058d6.bin
1024727e914cd5500c065a040f8509dd3c78d05110d88f596c86c73d0f05a2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D6 9412 bytes

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