Malicious PDF — malware analysis report

Static analysis result for SHA-256 c493a03a409331c1…

MALICIOUS

PDF

37.2 KB Created: 2020-08-10 11:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae1973a7ccdfe30b1ef425623f1eaee9 SHA-1: 2f28f0f73131a54453f2adc61c86792ac154e575 SHA-256: c493a03a409331c130a7e27df9156662ff107b04369db56a0512d07da9bf12dd
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL is https://ttraff.ru/pify?keyword=greatest+common+factor+word+problems+pdf. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to external malicious content. The ML classifier strongly supports the malicious verdict.

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=greatest+common+factor+word+problems+pdf
    • http://files.mindfulness-heidelberg.de/uploads/1/3/0/7/130739340/nozefadino.pdf
    • http://files.hijabeautiful.com/uploads/1/3/0/7/130739831/5151712.pdf
    • http://lowonugi.12chemistry.com/uploads/1/3/1/0/131071157/db6534.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/53532082785.pdf
    • https://cdn.shopify.com/s/files/1/0433/7198/7098/files/principles_of_conservation_biology_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/basic_electrical_engineering_book_by_bakshi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/zudezesuzafam.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/barisakun.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/pom_xml_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/51418494869.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2445/files/75466147816.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/96769511885.pdf
    • https://cdn.shopify.com/s/files/1/0430/1167/0179/files/django_queryset_to_json.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/buvijixumafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2039/files/31345424256.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_off00005203.bin
e532df7d605975e29a8e3cafbcec90cc9b186e2863af300421985eac2b3249b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5203 5564 bytes
font_01_sfnt_off000064e9.bin
5a4ec7063e869afbd2de6df422ded34e2d36abaa6ef7443ec5f10f62973ecf1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E9 10264 bytes

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