Malicious PDF — malware analysis report

Static analysis result for SHA-256 af36d609cdffc8d4…

MALICIOUS

PDF

50.9 KB Created: 2020-08-09 13:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 093bbb5189d21a59ddf23d4eef6c4220 SHA-1: d22d8eb6297bce333e4943b1734d32c2fcb18d98 SHA-256: af36d609cdffc8d409f85153d1fd34e9781f6a8c126e3fa03f76a29d665ac9f0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially corrupted, contains text related to file conversion and a URL that appears to be part of the redirection chain. The presence of numerous external links, many pointing to Shopify domains, suggests a tactic to obscure the ultimate malicious destination.

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=chuy%25E1%25BB%2583n+%25C4%2591%25E1%25BB%2595i+t%25E1%25BB%25AB+pdf+sang+%25C4%2591%25E1%25BB%258Bnh+d%25E1%25BA%25A1ng+h%25C3%25ACnh+%25E1%25BA%25A3nh+jpg
    • http://files.otvoroci.com/uploads/1/3/0/9/130969847/refoxurif-tasukizo-likisilusazumeg-pixiroxo.pdf
    • http://files.nawalnader.com/uploads/1/3/2/7/132711983/mupoluxininop.pdf
    • http://files.barnyardventures.org/uploads/1/3/0/7/130738998/romoba.pdf
    • http://files.karenjoyce01.com/uploads/1/3/1/4/131483097/buzaji.pdf
    • https://cdn.shopify.com/s/files/1/0428/6011/8175/files/apprendre_a_programmer_python_3.pdf
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/vufawuxujolelene.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0437/5665/0650/files/adobe_acrobat_pro_dc_crack.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98908457197.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/zamusevosoxamivasodoxikoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6774/files/luforojamejokax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/equations_of_kinematics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/17809416500.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0984/files/international_carrom_rules_and_regulations.pdf
    • https://cdn.shopify.com/s/files/1/0439/8183/2350/files/revud.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/lefepijapadudi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006033.bin
9e1c6dabc9ae235d8c9fc23c5e382372206c8b66468541e0a2f3bfd0f4efa529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6033 6588 bytes
font_01_sfnt_off0000748a.bin
483207e947485d47e0c3e694f6962f6358931ec57a8b832cc3e34fb6b36d9015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748A 22064 bytes
font_02_sfnt_off0000a404.bin
e1a26a1459345e5d86a6eeb4eefb9867edc491351cfa111eab7d47feb69fad31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA404 16860 bytes

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