Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d50a9977ada4f0c…

MALICIOUS

PDF

82.0 KB Created: 2021-01-25 01:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dfcf427da119a87e49982258f69e17ed SHA-1: 9e67d02189a9161c853844f662bb5e0e70282ad6 SHA-256: 8d50a9977ada4f0c2f2314f458e5ae4fa5ea401faba35f0b9b34e7ca89f3479f
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to redirector infrastructure or disposable hosting, indicating a link farm or SEO manipulation tactic. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the sheer volume and nature of the links suggest an attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=forklift+training+handbook+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fd274614856b.pdfIn PDF document text
    • https://tubuporupuruder.weebly.com/uploads/1/3/4/8/134879971/e3a03d8fd83c.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/jGhjQYW/dingtalk_lite_login.pdfIn PDF document text
    • http://verifybadgesbusiness.com/dozibemitaniydd5l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5ff3c0574040b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380392/normal_6003aec88d328.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/9jhijyN/bmc_bikes_for_sale_dubai.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449417/normal_5ffd56dacfbb7.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/bDghieT/fun_things_to_do_seattle_winter.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/NghjdFy/tiger_sharks_eating_whale_carcass.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fdf6f621f4bf.pdfIn PDF document text
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/fujoredu.pdfIn PDF document text
    • http://teenagetutor.online/5841344523007kpb.pdfIn PDF document text
    • https://sibanomo.weebly.com/uploads/1/3/0/9/130969588/lesedamipiwefi.pdfIn PDF document text
    • http://persequenteamsohbet.com/dimiluteru2wg25.pdfIn PDF document text
    • https://rotonozi.weebly.com/uploads/1/3/5/3/135315410/gutavizo-mulerujivadi-nanad-pebizubavuzefo.pdfIn PDF document text
    • http://betmoy56.com/22216291597sizvy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 5284 bytes
SHA-256: 6cfc0a007e0645038fd755b1638fc7bd6a0dfa69d761660e86a4c3f1f2dad90a
font_01_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 10992 bytes
SHA-256: 0f021375869dcdc25e864fd06efe09e72466baa8d8c4669197127a7e110ce099

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