Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24382683e7e6d46…

MALICIOUS

PDF

42.3 KB Created: 2020-10-04 21:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 92aac99f3a36c6d126e5f6a2f0dba820 SHA-1: 225498fc5f483a8029263804238598fc945ca79c SHA-256: f24382683e7e6d468ad08f894a8b5589bc5a7e6446ac805e0e74aa8838bc29b4
184 Risk Score

Malware Insights

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

The PDF contains a prominent link that directs users to a URL associated with malicious redirector infrastructure, disguised as a download for 'Subway surfers apk download unlimite'. The document also functions as a link farm, pointing to numerous other PDFs hosted on disposable domains, suggesting a coordinated effort to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cctraff.ru/strik?keyword=subway+surfers+apk+download+unlimite In PDF document text
    • http://files.sarahmonzonwrites.com/uploads/1/3/1/4/131437074/kinugebelol_janel.pdfIn PDF document text
    • http://files.halesworthinbloom.com/uploads/1/3/1/3/131380213/35c1f2d6cade.pdfIn PDF document text
    • http://jusako.potteryatwuwei.com/uploads/1/3/2/6/132681670/ruvinuni.pdfIn PDF document text
    • https://site-1036991.mozfiles.com/files/1036991/jijiwodigipunivoraduti.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/didipuvaxusirolig.pdfIn PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/zuzab.pdfIn PDF document text
    • https://site-1038905.mozfiles.com/files/1038905/pezutusokabudodeve.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/jiwala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e95a445-ff36-4200-9a15-5946ea4668b7/52668759324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1181e92d-f742-458c-86b0-f9808f82ea42/2229619089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ccc076-668f-4ad4-bd6c-3ceba29aa7b8/gujavawuxasalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1182f915-3ecb-49c9-b10d-08db90105575/10226338382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/74345759889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/standard_handbook_for_civil_engineers_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/ruradiverul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6587/9957/files/75764638106.pdfIn 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_off0000662c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x662C 5688 bytes
SHA-256: 717828f69db216cd7eea2f1e50206974e9f23bd7978ff9bfd1d018301c75c1b2
font_01_sfnt_off00007992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7992 10128 bytes
SHA-256: d63a2901b4e13dc0d2bd732569d1e6eccabaada2960a035312c60b2e262d2104

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