Malicious PDF — malware analysis report

Static analysis result for SHA-256 163f48a101296323…

MALICIOUS

PDF

45.8 KB Created: 2020-11-07 23:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9710899ecf930010cc125c3b94ecd699 SHA-1: 78a401cf223d1b78a6656c6c3e7a249e7724fe35 SHA-256: 163f48a10129632302c1749c77a92d9f04986b180c1ddf4edacec1bc825761cd
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. One of the primary URLs extracted is 'https://traffking.ru/123?keyword=ultimate+sherpa+throw+life+comfort'. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's high confidence score indicate a malicious intent, likely related to SEO manipulation or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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?keyword=ultimate+sherpa+throw+life+comfort
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5f892501add92.pdf
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/danipirodemadilar.pdf
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/2964153.pdf
    • https://cdn-cms.f-static.net/uploads/4443588/normal_5f9ca884534ad.pdf
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5f98a5ee6ebf0.pdf
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5f9fdfb1975a0.pdf
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5f9833fb38d0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nepawigexa/pebakalu.pdf
    • https://vasedaroxito.files.wordpress.com/2020/11/43559079740.pdf
    • https://gowatomu.files.wordpress.com/2020/11/furniture_crossword_puzzle_esl.pdf
    • https://rotadenig.files.wordpress.com/2020/11/82236523173.pdf
    • https://s3.amazonaws.com/mubefula/59477556197.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006df2.bin
b0d7f211cc6bcf46f58f3fbf99fea248d2d512ded9d5b714a0b04b14c856f2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF2 5340 bytes
font_01_sfnt_off00008004.bin
b795a58432b89b898afc11a38541398c0460f5b2a3fb17c79d371028ca1339fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8004 12120 bytes

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