Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae23e550b217137…

MALICIOUS

PDF

67.2 KB Created: 2020-08-20 13:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95bed84ccbf30e52a04592cb084051d8 SHA-1: d206989f963ac467650b3e8197fce80d659442d0 SHA-256: 7ae23e550b217137e8e05568691c8e248b66d873797a80366e08267536fe5685
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=ethan+frome+study+guide+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, indicating an attempt to disguise malicious activity as a study guide. The ML classifier also strongly indicated maliciousness.

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=ethan+frome+study+guide+pdf
    • http://files.lockdescape.com/uploads/1/3/0/7/130775528/monezosavorug-pimerarado-depuweliki.pdf
    • http://files.stjohn23rdadult.org/uploads/1/3/0/8/130813818/muxigori.pdf
    • http://vikev.missmaudiesmenagerie.com/uploads/1/3/1/4/131452883/f3193517a57d.pdf
    • http://files.dlake.net/uploads/1/3/1/4/131483445/xekav-bakinoxerexasak-vekatusufi.pdf
    • http://files.felicecurcelli.net/uploads/1/3/0/7/130775701/6621894.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/8924/5861/files/jikonuviluwakozunobew.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/gajekimimolonanotamikesok.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/airstream_nest_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/ielts_reading_practice.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/fugoxema.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/18_wheeler_game_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/27183062963.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7221/files/10024902496.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/badijevuxenajukitu.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_off0000ba39.bin
788c237aa1e2396037fa30639c189faec2fac9417e1128c3bce34f724efd2f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 5364 bytes
font_01_sfnt_off0000cc4f.bin
bc250fc902b6fb34a8d82cecaf439887dd1665fdcde44d55fe83b4c1f7064769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 10388 bytes
font_02_sfnt_off0000efd7.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 4324 bytes

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