Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c3a57e16de7bd5…

MALICIOUS

PDF

38.5 KB Created: 2020-08-26 00:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13cab53afa361b05b8a0e8a6218f9ed0 SHA-1: e8c7c85291ffa1e1cd50eb6287088e4f7cd44273 SHA-256: 42c3a57e16de7bd5c08a483bfe37816e83c332ef82af27de491e6a145613147b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, including a primary redirector at 'https://ttraff.ru/pify?keyword=non+proportional+relationship+defini', which likely serves as the initial lure. The presence of a large number of links hosted on various domains, many pointing to Shopify, suggests an attempt to obscure the true malicious destination or to leverage legitimate platforms for hosting.

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=non+proportional+relationship+defini
    • http://files.leannagant.com/uploads/1/3/2/7/132740747/6240091.pdf
    • http://files.tinglefinger.com/uploads/1/3/1/0/131070508/rimanonaxoteg-pafadex-duxotete.pdf
    • http://wixiferem.ashleykdrew.com/uploads/1/3/1/4/131406947/fawinijoti-baxifi-xugawukop-bijiweku.pdf
    • http://zasalo.tomasharanphoto.com/uploads/1/3/1/8/131871390/vodakawataw.pdf
    • http://xiwodi.senjistudios.net/uploads/1/3/1/4/131482916/kalozinuriweg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0462/1444/7257/files/76857551941.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5144/files/zadumuxiz.pdf
    • https://cdn.shopify.com/s/files/1/0446/4377/8723/files/mga_kasanayan_sa_akademikong_pagsulat.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/90758366961.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/87694471480.pdf
    • https://cdn.shopify.com/s/files/1/0464/5231/0184/files/dufirodu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/73975946246.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/86320266726.pdf
    • https://cdn.shopify.com/s/files/1/0433/8535/6449/files/16098371761.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1126/files/libro_automatizacion_industrial.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4519/files/2011_chevy_equinox_manual_shift_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/80592658420.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_off0000564f.bin
585db3972c40028b494eddfe5ae1b586dd5fc0a28fa9074aefcd5b500d2fb7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x564F 5100 bytes
font_01_sfnt_off00006793.bin
f7c1d188b80a81795adf756433970bd294291e160de8f403e9bca018cbcda305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 11004 bytes

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