Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5957cdebcb80748…

MALICIOUS

PDF

33.3 KB Created: 2020-09-12 03:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c3505bd394d9fadbd5a44b487ee6ffd SHA-1: 9105cdf50aa5a34421c08b14a1fe1f7a11ee907b SHA-256: c5957cdebcb80748bd229463af40caa873351d49c38740b6954fef35d21e48d8
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a link farm or redirection scheme. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.link/wix?keyword=bhootni+ke+song++mr+jatt
    • http://files.nordicwalkinglondon.com/uploads/1/3/0/9/130969139/1559376.pdf
    • http://mizuveda.dixborovillagegreen.org/uploads/1/3/1/4/131437490/zatujalogiganu-zepisen.pdf
    • http://files.stpaulsuccnola.org/uploads/1/3/1/1/131164024/0b021b420d10e1.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_10c3155fec4243dbb8327fb6766aefdf.pdf
    • https://static.usrfiles.com/ugd/1c8c1e_567501c6e00044e58bc24067060574d5.pdf
    • https://static.usrfiles.com/ugd/49be48_0435b450aeb546eda33f903573546bd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab2d59f632084276a5dc9f2cc36a11ed.pdf
    • https://static.usrfiles.com/ugd/d78803_71519a0600bc4270a189d6d0b1e59e0d.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/sewing_machine_repair_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/5397/9550/files/wordscapes_answers_level_946.pdf
    • https://cdn.shopify.com/s/files/1/0440/0008/4126/files/container_dimensions_in_meters.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/66418543312.pdf
    • https://cdn.shopify.com/s/files/1/0440/3717/7494/files/finebaxikivev.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5861/files/theme_park_ea_games.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/gisageb.pdf
    • https://cdn.shopify.com/s/files/1/0464/2507/9960/files/xesedekinajulofemupij.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_off00004574.bin
b75c70d52a94429fd212f7c33ae3cd5ad5b6278643a16344f5cdc74df0c16410
pdf-font-stream PDF embedded font (sfnt) at offset 0x4574 5256 bytes
font_01_sfnt_off0000572f.bin
ba9637510db108b9bafe9cf12625edeee99a7160cd082377108f5e07308dc195
pdf-font-stream PDF embedded font (sfnt) at offset 0x572F 9724 bytes