Malicious PDF — malware analysis report

Static analysis result for SHA-256 340d9f75727c7c78…

MALICIOUS

PDF

40.7 KB Created: 2020-08-17 15:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc0dc0e37f9421ed737ac7400926b10 SHA-1: c865848da3f2562f29d922b4b5759921b27e912d SHA-256: 340d9f75727c7c783f1ba97af9bacea7fac04579bcf585da82311ce36575f1ec
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'free casino games' and a URL that aligns with the malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially harmful sites through deceptive links.

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=free+casino+games+no++needed
    • http://tiwipuxok.amorim-neuropsychologue.fr/uploads/1/3/1/4/131453850/gaxapepa_doxolodafosot_nibovimusaw_kesus.pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapitawaluzosamorexub.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/defense_devil_manga.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/national_geographic_magazine_july_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3003/files/45817123094.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/71783288903.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/wow_classic_mage_leveling_guide_1-_20.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/xitapati.pdf
    • https://cdn.shopify.com/s/files/1/0434/0862/1719/files/67191538149.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/jefinipuzirugebomiwov.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_off000062a8.bin
400afebbd5625cabd217b13d9d39a6ce09a2958aa4d96ab7fb11743e9f16dbc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x62A8 5180 bytes
font_01_sfnt_off00007429.bin
2164c09d7d26d4d7e96064afebbd1857b14b2f9668f929f3d74b49da04a1e23b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7429 10064 bytes