Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2909f990d685d23…

MALICIOUS

PDF

43.7 KB Created: 2020-08-08 17:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a93b04a49794e4c1536c592854182143 SHA-1: 4d624a3beccdc40e336099b873996719494cdae1 SHA-256: b2909f990d685d23f1ed9732c59d982ef0960bc3bd0e1e2f138cd050e306853a
150 Risk Score

Malware Insights

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

The PDF contains a prominent link that, when clicked, redirects to a malicious URL hosted on ttraff.com. This URL is part of a link farm designed to appear as a legitimate document, specifically "behavioral interview questions with answers pdf", to entice users. The PDF also contains numerous other links, many pointing to Shopify domains, likely as part of a SEO-based distribution strategy. The ML classifier strongly indicates malicious intent.

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.com/pify?keyword=behavioral+interview+questions+with+answers+pdf
    • http://files.ralphschoellhammer.net/uploads/1/3/1/4/131408581/xereveruviwudet_ruxonofapapoxo_lufun.pdf
    • http://files.prairiefirebordercollies.com/uploads/1/3/1/1/131164202/841647.pdf
    • http://penut.audrayorktherapy.com/uploads/1/3/0/7/130776487/8a3020613a4.pdf
    • http://widexi.flfifedrum.com/uploads/1/3/1/4/131483281/7ea4c0640e.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/marifipokekekamanov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/somuvufunaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/74302195705.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5285/files/zimemiresixivuxemales.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/58777212528.pdf
    • https://cdn.shopify.com/s/files/1/0436/7712/2713/files/43051185465.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/tesan.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2102/files/arches_national_park_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/16686335846.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/76133486510.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_off00006cae.bin
fd19ec0155eed32627c8ddabcba7813b8741a2851e5174b9771d9ae9aa1830fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 5456 bytes
font_01_sfnt_off00007f4d.bin
4eb41079c9f8620f8f51ed6256d6397118b425c1819c488274f1c09fa4b986d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4D 10076 bytes

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