Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b74aad143e4c12…

MALICIOUS

PDF

44.4 KB Created: 2020-08-25 01:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1be11b1098516f274e62d6528cca57e SHA-1: 3d8fc89d90d73a04fb511a00d434f4e659f2777b SHA-256: 13b74aad143e4c12b7fdb39962a9cf70ae897ee691437d4780b23c61bbfcdc11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as an 'injury report' to entice clicks. This link points to ttraff.ru, which is flagged as malicious infrastructure. The document also hosts a large number of external PDF links, many of which are benign Shopify URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness.

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=injury+report+packers+cowboys
    • http://files.authormsmiller.com/uploads/1/3/0/7/130775679/gutinufizi_giropiva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/51475125771.pdf
    • https://cdn.shopify.com/s/files/1/0431/5047/5413/files/80476287787.pdf
    • https://cdn.shopify.com/s/files/1/0439/1033/2571/files/100_most_common_idioms.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/pitubuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8198/files/14820947667.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/saran.pdf
    • https://cdn.shopify.com/s/files/1/0466/5127/7477/files/79363701103.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/tetabamiso.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/3082169447.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/76676485391.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/drake_beyonce_can_i_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/46276329309.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000617a.bin
4bda94dbb62e0ce8aef888b99d545b9e42a2e3d6b9ed46876e7fb0e80102cb9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 5140 bytes
font_01_sfnt_off00007317.bin
231400b3a47826b3cf125292c947b297c1539cb7a0b1b1109d6be98b6ce097c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7317 10424 bytes
font_02_sfnt_off000096c1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x96C1 4324 bytes