Malicious PDF — malware analysis report

Static analysis result for SHA-256 f494bd64cb362070…

MALICIOUS

PDF

40.8 KB Created: 2020-11-02 10:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5b3a96ba318bdd6192bfafc5d0327a02 SHA-1: eccfe2cdcc1cc3807f8ce23a66be1c98f440cc7c SHA-256: f494bd64cb362070f38fedad9591a92609bb170dc7944a1953347b34100cd89d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with several pointing to known malicious redirectors or potentially malicious link farms. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links suggests an attempt to redirect users to harmful content, possibly for phishing or malware distribution.

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://gettraff.ru/strik?keyword=words+starting+with+carr In PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/kuxok-zivitigis-mesepeji.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/fuxosinomobefiret.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xenemavurinap_jokepirewiteda_fijalezej_gemewije.pdfIn PDF document text
    • https://jazezuko.weebly.com/uploads/1/3/4/3/134389352/gukitirexano-janosuniki.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/68395ed4-0b78-4a95-b10f-56d9d9e346e1/76275589858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f37c836-97bf-4f51-bc72-e575fd63efcb/harry_frankfurt_on_inequality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64efd7d0-ba1c-4dba-ba99-b8c0fa0b1377/99251183523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e01316-50be-47c8-8ad2-30dcd2e45f92/58859829015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2f5a9e-d66d-45ff-a158-2ffbfae3d965/26695658241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f861c1bd-b235-4c3f-b0a8-8207497b7018/nhaccuatui_lite_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/biparental_inheritance_of_mitochondrial_dna_in_humans.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_off00005d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D19 5276 bytes
SHA-256: 001aa966a96f68e1ce406418903621f879aa8d94c2f1a74a360d0c87ce0f05cc
font_01_sfnt_off00006f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1B 11904 bytes
SHA-256: b902ccd9e74761f09601c3f2328a89e6a64b73c9b0b5013fc8397db2e06fd18e

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