Malicious PDF — malware analysis report

Static analysis result for SHA-256 1286cf9df70b6a0f…

MALICIOUS

PDF

52.8 KB Created: 2020-07-29 19:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3abb7af36d631738ba92de69d5599de SHA-1: 8ddbfb3e3935450271bec06821f414d8acc01315 SHA-256: 1286cf9df70b6a0f95f6a78e05b0ccedfc9b9ec16188f394cf70442d95ad0fe0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a musical piece, likely to disguise the malicious intent. The presence of many external PDF links further indicates a link farm or SEO poisoning attempt to distribute malicious content.

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=beethoven+pathetique+2nd+movement+pdf
    • http://files.avilachildcarecenter.com/uploads/1/3/1/4/131483201/lolilesinuxez_sifewo.pdf
    • http://files.thehealthypetvet.com/uploads/1/3/1/4/131406321/5169423.pdf
    • http://files.glcaramada.com/uploads/1/3/1/4/131437119/9726120.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/98964217063.pdf
    • https://cdn.shopify.com/s/files/1/0439/4015/1454/files/18372216684.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/wewepesixotojanojufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0965/files/bufasara.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3697/files/vaxigenigorogukomigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/winoxilerudizixadejugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/wisuxavekativeselun.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/rutolad.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/49251792612.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000768a.bin
07338b973ea0435a12f1de28c90dbfffcc498589f104fe38ff8053db7a55ff52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 5224 bytes
font_01_sfnt_off0000882f.bin
21e00f36557f98b4f4c129fe060c54b52a8c89b3bba0a6be23b4e2a7580cfb69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882F 12752 bytes
font_02_sfnt_off0000b0ea.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 16120 bytes

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