Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faac995e60470db…

MALICIOUS

PDF

73.8 KB Created: 2020-10-11 09:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2e8478e24fcc914b17aca6b1cca11257 SHA-1: f868ba47abeca2371e17615adc6ac73b869a2273 SHA-256: 9faac995e60470db0092dd014475c81353b33a244fd41ac7e46c433a957f764b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector services, indicating a link farm designed to distribute traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector and a link farm. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links, suggesting an attempt to lure users to a malicious site for further exploitation.

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://gettraff.ru/strik?keyword=3406e+performance+parts In PDF document text
    • http://sofogez.tlccasolafarms.com/uploads/1/3/1/3/131379730/8438514.pdfIn PDF document text
    • http://vomasules.teacherslearningconnection.com/uploads/1/3/1/4/131452842/2e4b719a737b.pdfIn PDF document text
    • http://files.laurelparkespta.com/uploads/1/3/0/7/130775850/muradifuruxitudiken.pdfIn PDF document text
    • https://site-1038526.mozfiles.com/files/1038526/22297591821.pdfIn PDF document text
    • https://site-1039426.mozfiles.com/files/1039426/83626713189.pdfIn PDF document text
    • https://site-1038573.mozfiles.com/files/1038573/96272771759.pdfIn PDF document text
    • https://site-1039161.mozfiles.com/files/1039161/75913728205.pdfIn PDF document text
    • https://site-1036800.mozfiles.com/files/1036800/wedozibalivuvoxowegenut.pdfIn PDF document text
    • https://site-1041208.mozfiles.com/files/1041208/mubolawimixexuv.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/74037345-0bcb-4cc6-9f09-c7cb461175db/padotujimeziv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731d21c0-e648-462b-a100-8c6eb249e0f8/rituwoburudemupom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7908cbf7-2ca5-4f24-93ae-9f226fb95189/81065263600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97d2ed0-892a-4c76-959c-66bb8bc1fcad/mivesanoba.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_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 5584 bytes
SHA-256: ad80c3c6c4e8fe32eccd16d1cd6b156a4b3f757dedac32bbe8b92bb853517d26
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 9916 bytes
SHA-256: c361a740d976a685a671f0876f0aa99ae6bc7ee69db645461bc765a9c11aadfe

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