Malicious PDF — malware analysis report

Static analysis result for SHA-256 245b2be494cefe1f…

MALICIOUS

PDF

30.0 KB Created: 2020-11-07 11:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec4c58f15d5237cd3838f154adb417c SHA-1: 73f2a295e710d2fa11bb1fde37246f861e5f12da SHA-256: 245b2be494cefe1fe8f2ff0c172311a1860a37242ef62bb61c183e31d02b05ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that is also present in the embedded link farm, suggesting an attempt to drive traffic to malicious sites.

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://traffmen.ru/123?keyword=definition+of+functional+region+in+geography
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muxegeza/31613534445.pdf
    • https://s3.amazonaws.com/kovilowab/19202476999.pdf
    • https://s3.amazonaws.com/subud/at_dev_english_to_bengali_dictionary_free_download.pdf
    • https://s3.amazonaws.com/fekazudabo/trufix_and_trucontrol_reviews.pdf
    • https://s3.amazonaws.com/pamavon/mutants_and_masterminds_3rd_edition.pdf
    • https://s3.amazonaws.com/jamokaroxoj/ammonia_gas_sensor.pdf
    • https://uploads.strikinglycdn.com/files/f5367589-3a12-427b-9cce-32c9c86f3942/5118926134.pdf
    • https://sabavafef.files.wordpress.com/2020/11/dougal_dixon_man_after_man_espa.pdf
    • https://s3.amazonaws.com/vososasoxumete/48571582281.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_off00003c79.bin
8ef9752a9d0e2bc3da4350366591017f3100b4a3dd46d7ab2250362978be900e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3C79 5200 bytes
font_01_sfnt_off00004e38.bin
f2893ed7abbc960ad2c2b09a8460a9379c161cb85b8e14a8e73a008443a9c5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E38 8588 bytes

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