Malicious PDF — malware analysis report

Static analysis result for SHA-256 b621f8dd3a7dab7f…

MALICIOUS

PDF

51.9 KB Created: 2020-07-31 02:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c04430fe0803044f7fa5777a755d4f7 SHA-1: a67990375c84cb85dd21c4a8e11cf0a7d514ad0d SHA-256: b621f8dd3a7dab7f2adc5a4dc837e21ab1323226ac12356c2129dc307a08350e
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=snake+game+c+code+pdf, which likely serves as a gateway to further malicious content. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious 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.com/pify?keyword=snake+game+c+code+pdf
    • http://files.thefutureofdemocracy.net/uploads/1/3/1/6/131607010/rafikewibadidur.pdf
    • http://files.themerchantsguildstore.com/uploads/1/3/1/4/131453156/rozutelalavus.pdf
    • http://files.crescenttrail.org/uploads/1/3/1/6/131606431/zobefurolimowef.pdf
    • http://files.acceleratedancearts.com/uploads/1/3/1/8/131856277/9477578.pdf
    • http://files.discoveryroofing-oahu.com/uploads/1/3/1/8/131856380/6862220.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/16754444429.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/52740320180.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/mafoluzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/midafasabumefobevedox.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/36450227178.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/matoxijixolavune.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/41271885914.pdf
    • https://cdn.shopify.com/s/files/1/0434/6236/1245/files/69506123183.pdf
    • https://cdn.shopify.com/s/files/1/0440/4104/4118/files/wideritufaveg.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/52886642416.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/mikuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/16456591623.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_off0000815e.bin
e75c84c86e7f68563e423bd15bae21ba21a730f82d2ece01dd9ee106c8d70b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815E 4996 bytes
font_01_sfnt_off00009242.bin
ed9719c24f6be4c0f0b5548465e6868ebcd4f677125c45154d2103531c0f68e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9242 14672 bytes

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