Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a312eabf1fdd455…

MALICIOUS

PDF

38.4 KB Created: 2020-08-24 05:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c86993cc218849046899c7b879f3e833 SHA-1: d4dd82b277706f081a1a6b599c2b2d5396bb097e SHA-256: 1a312eabf1fdd45511804143587eb2107ec8059bc3d4138e89ba28e77b7270aa
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a high number of embedded links, with one identified as a known malicious redirector. The document body contains garbled text but includes the malicious URL. The presence of numerous links, including to a redirector, suggests an attempt to lure users to malicious content or exploit SEO tactics for distribution.

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=idealist+%25C3%25B6%25C4%259Fretmen+grigory+petrov+pdf
    • http://files.alisonlmiller.com/uploads/1/3/0/7/130739343/tuweralowoze-vunipevuxezede-tepemewikigi-fatavodanixabij.pdf
    • http://pasoni.nutterscrossingcommunityhoa.com/uploads/1/3/1/8/131857114/nuzisojujebupulaj.pdf
    • http://files.mascaretbay.com/uploads/1/3/1/4/131452840/8237118.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/aluminium_sheet_weight_per_m2.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/jexakeratosuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6734/9923/files/5_1_practice_classifying_triangles_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/wowanikavepaferimixaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/moladunugovuvupatukalapur.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3540/files/autodesk_fusion_360_tutorial_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0435/4975/3507/files/55092464889.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.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_off00005369.bin
ecd1896622c0cb3f259baa009b42df01f308eba7f9cad76d5771e40d419d3aad
pdf-font-stream PDF embedded font (sfnt) at offset 0x5369 5828 bytes
font_01_sfnt_off0000667a.bin
95dcb9e34ef8b54e62b196843d66b4a3a0b273b5c4193d0afea2e1b402e15d6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 11404 bytes