Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f629585cd5e3519…

MALICIOUS

PDF

40.7 KB Created: 2020-07-30 22:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d8d370862e5dd4face7a3a2b3724f0f SHA-1: 388cb5bd20fc5ada417b2083b849c7709422440f SHA-256: 6f629585cd5e35199fbad24e11ef1013a617e7a00b7c80a81bd6779f5e01ef64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large farm of external PDF links. One of the primary URLs points to a known malicious redirector, suggesting an attempt to lead users to harmful content. While no scripts were extracted, the structure and heuristics indicate a malicious intent to distribute links.

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=alexandra+gheorghe+amantele+trecutului+pdf
    • http://files.elishaharteis.com/uploads/1/3/1/4/131438389/183f2146.pdf
    • http://files.melissagunasena.com/uploads/1/3/1/4/131438468/josobivituraki.pdf
    • http://files.ambcircleoffriends.com/uploads/1/3/1/8/131871494/supare.pdf
    • http://files.6newplays.com/uploads/1/3/0/8/130813314/6994237.pdf
    • http://files.summersongmusiccamp.com/uploads/1/3/1/4/131454052/484498.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9268/0605/files/48103224087.pdf
    • https://cdn.shopify.com/s/files/1/0432/1171/8820/files/3190191219.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/76436761717.pdf
    • https://cdn.shopify.com/s/files/1/0430/2949/5959/files/wudugobizurexom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9767/0303/files/nudotebojelolusuwazebaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6775/2100/files/gufuvitibere.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/11060141110.pdf
    • https://cdn.shopify.com/s/files/1/0440/1129/0782/files/73796020852.pdf
    • https://cdn.shopify.com/s/files/1/0428/9524/5475/files/41046463872.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/tojuriv.pdf
    • https://cdn.shopify.com/s/files/1/0437/9613/6097/files/99563056895.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/86738856210.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eac.bin
25223bd2b0f399faa952a73cff1052883593dcdfe4b81072b3a07568f8e27f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAC 5332 bytes
font_01_sfnt_off0000709e.bin
b209fd9ff7ef30ab24a5ce598fe879b6b6e5a6d3fd6480b3b88c543a9e075645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709E 11072 bytes

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