Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1691a1b8bb433b…

MALICIOUS

PDF

37.4 KB Created: 2020-08-06 00:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f122ed795801e1ccec1837c778082b9 SHA-1: 10f09edd65fcab755ed060af114d742f0dadde12 SHA-256: 0c1691a1b8bb433bd1c41a90221e7434667e929e70b9916b1b7f907a44471e5a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=apsrtc+bus+pass+form+pdf', which is presented as a bus pass form. The document also hosts a large number of external PDF links, many of which point to benign Shopify domains, but the presence of the malicious redirector indicates a clear intent to lead the user to harmful content. The ML classifier strongly supports the malicious verdict.

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=apsrtc+bus+pass+form+pdf
    • http://videtu.acupunctureblueturtle.com/uploads/1/3/0/8/130874317/dosigivupo.pdf
    • http://files.heartsharespringgala.com/uploads/1/3/0/7/130775942/3396789.pdf
    • http://files.joyinchristchurch.com/uploads/1/3/1/3/131379801/zixowatalijisa_konunogodure_zuwene.pdf
    • http://files.best4youmassage.com/uploads/1/3/0/8/130874361/7417747.pdf
    • http://files.nadjalitau-photography.com/uploads/1/3/1/1/131163927/752769c31d396f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3771/files/makkar_ielts_speaking_pdf_2020_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/topop.pdf
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/96611733580.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5988/files/37988300558.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/najovadutipukugerililage.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/zuligixitubibijubupeja.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/how_to_trade_up_in_cs_go.pdf
    • https://cdn.shopify.com/s/files/1/0430/7291/3557/files/67326206142.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/bk_coupons_august_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/5592/3878/files/bobbi_brown_makeup_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94192334972.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/tepirisezetulud.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_off00005364.bin
3e5857b85886b322f07e7f18de843b8199a84c773852cc9528129a6cf61b27cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5364 5396 bytes
font_01_sfnt_off000065a4.bin
a2a9b45e170159f09df93eb6f54f963504103d3bae344e3a4f23aeeb804301b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A4 10244 bytes

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