Malicious PDF — malware analysis report

Static analysis result for SHA-256 651e049690ad8b9e…

MALICIOUS

PDF

59.4 KB Created: 2020-08-10 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7688ac84ba849de7376acdf10f169f64 SHA-1: 284a76c63fa8d50ea4bc78fd4884c7c6ce08e493 SHA-256: 651e049690ad8b9edd4850a9670e0b3bc13be00d4daaa62688e15e817e622b24
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'applications of differential equations' and the authoring application 'wkhtmltopdf', suggesting a lure for SEO poisoning. The presence of multiple external PDF links further supports this, indicating an attempt to drive traffic to potentially malicious or spam 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.cc/pify?keyword=applications+of+differential+equations+in+mathematics+pdf
    • http://wiwuj.americasprincipal.org/uploads/1/3/1/8/131856318/buzugumupet.pdf
    • http://files.seniorcenterfriends.org/uploads/1/3/1/4/131452804/2423162.pdf
    • http://bazev.shenandoahpiper.com/uploads/1/3/1/4/131437508/8be366659153b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/nike_coaches_of_the_year_clinic.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/26215650929.pdf
    • https://cdn.shopify.com/s/files/1/0434/1733/8005/files/english_calligraphy_handwriting.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/87073391501.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/juvatunevejiwerixopo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6652/3809/files/bass_tracker_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/fokijujuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6343/4654/files/kivanu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/buvepomow.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8922/files/life_in_mono.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/tosuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4235/files/bikhre_moti_full_book_free_download.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_off00008d2a.bin
b51dcd72f404dc151aec5f1e11a4864af33af9e657d4b3869396c0f0249d125e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2A 5508 bytes
font_01_sfnt_off00009fb5.bin
6bb6ec5636d1ae76971cb08e8530bae410c98a1ffc48fa3491b72f14d57485a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB5 13604 bytes
font_02_sfnt_off0000cb01.bin
5f26caebf9be23218f5d346afd9088fa63177b9919c3dd01a3c435c5c1e51257		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 16088 bytes

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