Malicious PDF — malware analysis report

Static analysis result for SHA-256 8674a2430d0869c1…

MALICIOUS

PDF

47.9 KB Created: 2020-08-05 11:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb2d17f0e3bdacbdbb549bde002589c SHA-1: 2ef52aa497d60a8b1245d74d437e7b9d8b38fc8c SHA-256: 8674a2430d0869c18a6f3b71b4b9c338a6f455f0b984446cf5ce923c0a12ecb6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a redirector to malicious infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm designed to attract traffic or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.ru/pify?keyword=guitar+chords+made+easy+pdf
    • http://revijoni.wickycandlesllc.com/uploads/1/3/0/7/130739616/a5980a82089.pdf
    • http://files.addylucandles.com/uploads/1/3/0/8/130814078/gavafeboverigano.pdf
    • http://files.mjpcatholic.com/uploads/1/3/0/7/130775982/7816872.pdf
    • http://files.affinityspeech.com/uploads/1/3/1/4/131453194/gakumadod_fatanozupuvoxaf_vewix_wikoxerikawogo.pdf
    • http://files.lacibirth.com/uploads/1/3/1/3/131398419/mopaxuj-sufakig-xuwapama-fisuzuteke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5181/7883/files/badopu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3852/files/molikonodomebedukajoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/sifubonejijabefowasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/89843837757.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0512/files/fudotexanofufamamusi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/43021498532.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/17717879887.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/xekokawusazek.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/72286667694.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/nursing_report_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/users__user_library_caches_google_chrome_default.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/newugetimizub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000716b.bin
9e94981c32cc485c5ff39aa5f07cdadf11a9862a161dbea53d45182811df3a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716B 5496 bytes
font_01_sfnt_off000083f3.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F3 1800 bytes
font_02_sfnt_off00008c81.bin
1cb889b7a9a025ae8707793c31574d91a7ecec392d12ae5e6548c8d62fc0ec00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C81 11204 bytes

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