Malicious PDF — malware analysis report

Static analysis result for SHA-256 f121cd7b9908c79c…

MALICIOUS

PDF

37.5 KB Created: 2020-08-19 16:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5292367fd02c8b5aaed1de9775b1726 SHA-1: 42a7eeea8bd36d7adcff77daa8fc58acb6f2f9ad SHA-256: f121cd7b9908c79c1cc9fa9d5632ea1154d1ccc552b8bbccd1663901bf2216d9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a 'Bengali dictionary Java app' lure. This link, `https://ttraff.com/pify?keyword=bengali+dictionary+java+app`, points to known malicious infrastructure. The document also features a large number of external PDF links, many hosted on `cdn.shopify.com`, which is indicative of a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=bengali+dictionary+java+app
    • http://files.joshreynoldsyeo.com/uploads/1/3/1/3/131383541/tokalewutexatad_loxekusak_dafojuwejesunep.pdf
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/63972340355.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/14416246057.pdf
    • https://cdn.shopify.com/s/files/1/0429/1136/7331/files/42697670624.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/pivaguvizerisuvaludakutud.pdf
    • https://cdn.shopify.com/s/files/1/0430/3237/9545/files/33318660579.pdf
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/resekasivugolizimakuxujaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/luluzawuvino.pdf
    • https://cdn.shopify.com/s/files/1/0432/5916/6888/files/veterans_day_facts_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/vibebibukalil.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/98399889597.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/zolewibawixod.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_off00004afa.bin
234561cb0a28f290b29f15cc8b350ce6e82dd728717f2209c827535e94f628b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFA 5352 bytes
font_01_sfnt_off00005d4b.bin
3fe9aa4d3b9e7d7e6cd290fc5e8a4663364be9427665f844d792dca865de3df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4B 13500 bytes

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