Malicious PDF — malware analysis report

Static analysis result for SHA-256 946bffef4972d133…

MALICIOUS

PDF

37.9 KB Created: 2020-09-01 01:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16aa0269e443cc9f7561d57f4c162469 SHA-1: f22203009a3fbf92257338dc84b1b781bffa59d1 SHA-256: 946bffef4972d133beab66463fec1a59c5603e9c247f62610a995227fdee00f5
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to 'https://ttraff.ru/pify?keyword=google+assistant+go+apk+latest'. This URL is designed to trick users into downloading potentially malicious content by impersonating a Google Assistant download. The PDF also features a large number of external links, many of which point to benign files, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=google+assistant+go+apk+latest
    • https://static.usrfiles.com/ugd/b8c837_8c369762975a41ddad84b8131cc23851.pdf
    • https://static.usrfiles.com/ugd/d1c05f_a3d1e400b10f441cb1a73beb9fd9ce0e.pdf
    • https://static.usrfiles.com/ugd/a18aa6_a97a0170fde54ae1bb51109a05e31c4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea145fc830984c73b15303f77353c4a6.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/61718731105.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/92582000890.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/milling_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/zojasesirobunivafiditiwiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/67530538101.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/wimupafawolejikoveloso.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/somasasonagozogekamodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4524/files/manual_de_auditoria_financiera_contraloria_peru.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/gidop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/battlestar_galactica_boomer.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/39295771275.pdf
    • https://cdn.shopify.com/s/files/1/0441/0517/1096/files/performing_arts_jobs_brisbane.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/kendo_grid_filter_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/83346132828.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_off000056eb.bin
9d62801ce984e83d6c2c6c74f493c0b154ede1811c5fbd3040386944229c0b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EB 4988 bytes
font_01_sfnt_off00006804.bin
4dd488ab2d92793652b78639e281d434fb282cf7205ace9d5880c43ba4c8aa31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 10184 bytes

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