Malicious PDF — malware analysis report

Static analysis result for SHA-256 0776a73d3dd0b048…

MALICIOUS

PDF

67.0 KB Created: 2020-11-17 19:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f651e1bd00c325c0c62544781739f26c SHA-1: 1bc29d8bc5aff899813637e93f0ad5066f6e96f6 SHA-256: 0776a73d3dd0b0487ca93026e89b14834a35434bf4ef430148179dd3da00dd5d
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to redirector infrastructure and a link farm designed for SEO manipulation. The primary malicious URL identified is 'https://gettraff.ru/123?utm_term=takagi+tk4+installation+manual', which is flagged as a malicious redirector. The document's content, though heavily obfuscated, suggests a lure related to installation manuals, likely to trick users into clicking malicious links. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=takagi+tk4+installation+manual In PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/lopuma-japokogunowa-pizejoset.pdfIn PDF document text
    • https://fadibukomu.weebly.com/uploads/1/3/4/3/134310842/7236064.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/09919293.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/feguviwi-losut-nimosifoxoratak-biwirixix.pdfIn PDF document text
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/da255db1f4e1de1.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/16123d1a-40bf-423a-bc1c-5a8b96ea3779/profoundly_meaningful_crossword.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/63132868767.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/sly_park_waterfall_trail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46392c4-47e6-4163-8756-2a5a32190e6c/40334700087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccb8f59-d262-4a81-b856-6c2cb3ca8339/29995565732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b3e2b8-f382-4cde-ab8d-b8d5ea4bd20a/vozasaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e57e5d-ef62-4ed9-a42e-8f907e6865fd/zunigupiloveb.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/organic_chemistry_functional_groups.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/the_spoils_system_definition_us_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024acdcf-d4da-47bf-bd32-e73418a79428/moxesuba.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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 5008 bytes
SHA-256: 50ab4a767f9088594d3e5377d72e2647b0c5823ad449b1c72e38b7b024c4e5f7
font_01_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 10132 bytes
SHA-256: 1881c44b73290c94f45c18630b44ac23c749030b1e8cc07bf7f89f76bf73ac79

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