Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11ee83e5a696d7b…

MALICIOUS

PDF

43.7 KB Created: 2020-08-07 01:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d497323a4963d99c9fe2739240dfcc6e SHA-1: 67f39855ed657299b7e8f0ccd9664b24e8fd43a5 SHA-256: f11ee83e5a696d7b50e20754a0204333d7fe77e98e7ad1105d54bc0223ce5c4b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=bsc+syllabus+pune+university+pdf`. This indicates the document is designed to redirect users to malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many hosted on `cdn.shopify.com`, suggesting an attempt to manipulate search engine results or distribute content from various sources. 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.cc/pify?keyword=bsc+syllabus+pune+university+pdf
    • http://files.carmineruddy.com/uploads/1/3/2/6/132683154/kevapozadupuxe.pdf
    • http://files.beyondbodyclinic.com/uploads/1/3/1/3/131383456/dibakemetaw.pdf
    • http://files.nogymnoproblem.co.uk/uploads/1/3/0/9/130968996/tudaxopudikexusezej.pdf
    • http://files.clareslaneycounselling.com/uploads/1/3/0/9/130969405/xakidebuda_pikilogi_lemojidefidax.pdf
    • http://files.themilehighmacs.com/uploads/1/3/1/3/131384777/lorizobex.pdf
    • https://cdn.shopify.com/s/files/1/0432/2607/1199/files/doxepizuke.pdf
    • https://cdn.shopify.com/s/files/1/0439/4100/3432/files/dajigiguba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mogapusezonoxifetomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/19585722196.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/food_adulteration_project.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0726/files/holland_america_nieuw_amsterdam_deck_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/70978194438.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/cardiac_sternal_precautions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/tekax.pdf
    • https://cdn.shopify.com/s/files/1/0444/7030/4935/files/espn_nfl_2k5.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_off000062c6.bin
2bef786581a97191f2ac647bf5877c9e6a5b78b504e24ecb5720534ae8765a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C6 5500 bytes
font_01_sfnt_off00007597.bin
c298fb7ff9bf8d5f3f7e9f9059bd2f82854b097bb9704a28df77101363e34473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7597 14200 bytes

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