Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e82144120263363…

MALICIOUS

PDF

32.2 KB Created: 2020-08-28 06:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 675c69c1d18c53aa1478aed2a87354b4 SHA-1: 2938c6a47d7afbf38c9caa1d159c1e4ebd161744 SHA-256: 5e821441202633631335fa02edf00bdaa0bed9e253c45b5aed83084e34d235e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=gucci+mane+hard+to+kill+zip
    • http://files.autoencyclopedie.com/uploads/1/3/1/6/131636941/fuzaxu-popejolu-kapope-figafun.pdf
    • http://files.collegemoversandhauling.com/uploads/1/3/1/4/131438114/dc3a842cf4394.pdf
    • http://files.happson.com/uploads/1/3/1/4/131454238/vapera_puvifogok_likomij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/gerexabel.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/kunekevuwexuguleno.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3961/files/65609695528.pdf
    • https://cdn.shopify.com/s/files/1/0429/0091/4343/files/types_de_pronoms.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/foreve.pdf
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/saditevimolufazaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/mods_gta_5_online_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7211/files/gcse_sequences_worksheet.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_off00003fd6.bin
e1ba1ca4745d42780fef2ddfa79311097dc90047b354710c6c88422145fabcb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x3FD6 5280 bytes
font_01_sfnt_off000051a2.bin
3ea3986cb312238bd5c1bcf2b2f1b9322deb33179351f11b8fb7eeb3be76c240
pdf-font-stream PDF embedded font (sfnt) at offset 0x51A2 10280 bytes