Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f10b7713332d55…

MALICIOUS

PDF

40.4 KB Created: 2020-08-12 03:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5af7cc930dc3c45740d031190257e98 SHA-1: cb12ebcde9ad20675cc08e044e5a0a7af576aa54 SHA-256: 92f10b7713332d55f01fda913c11a287301d5a31eb3bc2cbf5ace21b3a6ed5ce
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with 30 external PDF links identified, suggesting a link farm or SEO manipulation strategy. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=seliwanoff+test+for+carbohydrates+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL. No scripts were extracted from this sample.

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.com/pify?keyword=seliwanoff+test+for+carbohydrates+pdf
    • http://files.mmtimage.com/uploads/1/3/1/3/131379540/tonazi_bagudisegelopu.pdf
    • http://files.umdtreblemakers.com/uploads/1/3/2/6/132682124/d0235fdbe77d2c.pdf
    • http://files.originscentre.org/uploads/1/3/1/6/131606260/2242430.pdf
    • https://cdn.shopify.com/s/files/1/0439/8609/2190/files/kg_to_lbs_converter.pdf
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/45679633033.pdf
    • https://cdn.shopify.com/s/files/1/0430/5305/6149/files/66266135204.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/30540020543.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65039204935.pdf
    • https://cdn.shopify.com/s/files/1/0432/2381/0203/files/86553915045.pdf
    • https://cdn.shopify.com/s/files/1/0439/5171/8558/files/17967226983.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8726/files/9563755646.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/surah_al_naba_with_urdu_translation.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2317/files/gungeon_full_metal_jacket.pdf
    • https://cdn.shopify.com/s/files/1/0433/0769/6286/files/23855781324.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9072/files/someone_anyone_something_anything_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8493/files/javibusubo.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_off00005e15.bin
66fa3f5ed6a013d44b0840b4a4348272be7b7b0addf3b3b1abbc2cbc7c1f9d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 5680 bytes
font_01_sfnt_off0000716e.bin
468868c79b2e01b9b072c264549b5d89d3023a9f3c5439d5e488879c77541a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716E 10344 bytes

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