Malicious PDF — malware analysis report

Static analysis result for SHA-256 0935c65da33d203d…

MALICIOUS

PDF

40.3 KB Created: 2020-08-03 17:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84107c6a2560c51e4f969a7e7e662b9e SHA-1: 84f85d5b16b2b97d8b36f7d932e476a3ac2eaa09 SHA-256: 0935c65da33d203d920f20b15ba3f5729db4a830761367eb4d83a971337d9596
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.com/pify?keyword=partnership+accounting+problems+and+solutions+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking Shopify links, likely intended to mask the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=partnership+accounting+problems+and+solutions+pdf
    • http://files.thesekidshavetalent.com/uploads/1/3/1/3/131380688/lajasugolepapuw.pdf
    • http://files.mwpto.org/uploads/1/3/0/8/130813821/nizokixa.pdf
    • http://files.bandpjoinery.com/uploads/1/3/1/6/131637240/rosexu.pdf
    • http://files.heaterpcbrepair.com/uploads/1/3/0/8/130815014/d0140e167f2ca6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/gexoximiteluxojavop.pdf
    • https://cdn.shopify.com/s/files/1/0433/8152/2599/files/77658993588.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/vumotetakewefidoxoguv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/29587197651.pdf
    • https://cdn.shopify.com/s/files/1/0439/5424/1694/files/lizodivusud.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/44854249854.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/xofedijafofej.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3041/files/64908749173.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/zaxugubufadawive.pdf
    • https://cdn.shopify.com/s/files/1/0429/6582/7747/files/fire_works_animated_gif.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/dugoxidebekasazumisu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.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_off00005e0b.bin
c980f087a047f962700867504f5b0353677185e89352047ac89b2e4e5fc547ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0B 5712 bytes
font_01_sfnt_off0000714c.bin
aee9f4037bb1317025b7388d1141c0343660c753c9a1c9296d85232cf5e28f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714C 10212 bytes

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