Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe92ef5af88da119…

MALICIOUS

PDF

45.1 KB Created: 2020-08-01 22:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1899252ae81a1a7c2d37fc6115c6dbb SHA-1: 380a30d954eecb30ad828720a0cfb26add2e8d8c SHA-256: fe92ef5af88da11991d2a2c102b7f22b3979e02593ebbd1283b188499dbeba16
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting a tactic to broaden reach. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users through these links to potentially malicious content.

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=underworld+meg+cabot+pdf
    • http://files.tranceformlife.co.uk/uploads/1/3/1/4/131437515/386d9d9.pdf
    • http://files.katherineorchard.com/uploads/1/3/2/8/132814400/zuxuxod_denojavopovute_givagipepisopod_sipasawu.pdf
    • http://files.adamswellscrisiscenter.com/uploads/1/3/1/8/131871852/3e0e7.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/tomuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/pitobebogikajibigukamolad.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/jejipire.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/24489154743.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/toferumada.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/dinaperepowuvumavememuwej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73807437975.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/17581947186.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/povupesuwaxogore.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/nozazexisiteselojefiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/43567236414.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66923604261.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071cb.bin
7b3175dabfe42d8bc36966936101003fe4a7735b41a886be7a504cecabf315c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x71CB 5520 bytes
font_01_sfnt_off0000848c.bin
124cb7445621623efc1893c2bafe4e26ea41ad6a1c084170725b4e0ede77b503
pdf-font-stream PDF embedded font (sfnt) at offset 0x848C 10432 bytes