Malicious PDF — malware analysis report

Static analysis result for SHA-256 09777b7fa589de92…

MALICIOUS

PDF

36.8 KB Created: 2020-05-31 15:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9793dae43f21dc608c481823194ef40 SHA-1: 7912484cfd8994e2bf173d39fca3366f31b39bb0 SHA-256: 09777b7fa589de92e1c0905bb5748b834252fc7ea85851033164d063b31d637c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to suspicious domains. One critical heuristic identified a link to a known malicious redirector, and another flagged the document as a link farm. The ML classifier also strongly indicated maliciousness. These findings suggest the document is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wp3?keyword=export+to+pdf+asp+net+c%2523#export+to+pdf+asp+net+c
    • http://alohiki.com/uploads/1/3/0/9/130969835/zapikiwoweloja_kulolilibaweso.pdf
    • http://kisservicing.com/uploads/1/3/1/4/131453676/7436991.pdf
    • http://lecky.com/uploads/1/3/1/6/131637143/59d7b050.pdf
    • http://careercaf.com/uploads/1/3/0/8/130873915/pisikajazozog.pdf
    • http://9f60fpk005.com/uploads/1/3/0/7/130775786/721528.pdf
    • http://jamestedrow.com/uploads/1/3/1/4/131409017/3106221.pdf
    • http://dougzanderart.com/uploads/1/3/1/0/131070874/b6ad694db.pdf
    • http://drjeffreybaruch.net/uploads/1/3/0/8/130874124/xezup.pdf
    • http://frc5150.info/uploads/1/3/0/2/130272442/ee04b7f6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jakupurozeju.files.wordpress.com/2020/05/81305900895.pdf
    • https://zibebuti.files.wordpress.com/2020/05/maxiledo.pdf
    • https://wajojewo.files.wordpress.com/2020/05/ranalitev.pdf
    • https://rapapoxu.files.wordpress.com/2020/05/81256967456.pdf
    • https://susawakixer.files.wordpress.com/2020/05/61266445769.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000566c.bin
ba7c231ec5b913683ce546a21aadc7846a1a9778bad9513d53e2c00fe1e685a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566C 20996 bytes

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