Malicious PDF — malware analysis report

Static analysis result for SHA-256 242cd140b792f4c6…

MALICIOUS

PDF

49.8 KB Created: 2020-08-21 15:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f5be66c97e0788923a95ddd84e58e20 SHA-1: c375a0e28e655c1ad71919e19b7afcf7ec084a41 SHA-256: 242cd140b792f4c6bf6b9f5f8d0d9c6f53ccf7badcf2a2e2182565abcf47ba7f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate guidebooks but redirect to potentially malicious infrastructure. The primary redirector URL is `https://ttraff.ru/pify?keyword=learnzillion+guidebooks+3.+0`. This technique is commonly used to distribute malware or phish for credentials by leading users to compromised or malicious websites. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirector and a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=learnzillion+guidebooks+3.+0
    • http://files.ithoughtidbemarried.com/uploads/1/3/0/8/130874063/pexitafi.pdf
    • http://files.lauraguayartclass.com/uploads/1/3/0/8/130814432/6abac0.pdf
    • http://vojezob.fiercemally.com/uploads/1/3/0/8/130874493/7658729.pdf
    • http://files.repofskilz.com/uploads/1/3/1/0/131070526/pinisilekanij.pdf
    • https://cdn.shopify.com/s/files/1/0438/4679/5414/files/waturibamaxazogepumokonaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/how_to_change_dpi_in_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/86790664714.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/xipuropumebuzodevawopona.pdf
    • https://cdn.shopify.com/s/files/1/0429/2024/7462/files/felodediniloguxenaludowir.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/23731615403.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/nirisuwatidigixel.pdf
    • https://cdn.shopify.com/s/files/1/0429/0736/9639/files/spelling_checker_free_software.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/31396544135.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/c_matrix_multiplication.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/application_letter_for_a_job_sample.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_off0000869d.bin
9f665a7e8957b8cd21ec2f6da0d11eb5faf1c6b613335e1fa5b34393504d255d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869D 5528 bytes
font_01_sfnt_off00009978.bin
b5a5e173d9a3d8963a0e33924a883bce247502b190d0c1a669d26c972d464bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9978 9676 bytes

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