Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4c07d3cd2a1cd9…

MALICIOUS

PDF

38.4 KB Created: 2020-08-11 13:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abea26174650b487166f964a9c47663d SHA-1: 9cd3f9b10fd2888a61c9f75a89a34590b6804c6a SHA-256: 4f4c07d3cd2a1cd93d7066489d2b0ed79eba0c63a45d8a6932630ff3f6c18c85
150 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=sri+rudram+chamakam+in+kannada+pdf`. Additionally, it contains a large number of embedded links, identified as a PDF link farm, with many pointing to `cdn.shopify.com` domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious sites through a deceptive link farm.

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.cc/pify?keyword=sri+rudram+chamakam+in+kannada+pdf
    • http://files.henkpeetersarchive.info/uploads/1/3/1/3/131380889/fevirabevijozeke.pdf
    • http://files.serenity-gbd.co.uk/uploads/1/3/1/6/131637419/6028597.pdf
    • http://files.divinesoulenergy.com/uploads/1/3/0/9/130969819/d55ccdadbe3c.pdf
    • http://dikaku.jgulbrandsen.com/uploads/1/3/0/8/130814328/wunonafosifeje.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/effects_of_air_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0429/5547/3059/files/73671498597.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/vovetumawakixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/25438258321.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/oracle_database_11g_pl_sql_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/65977264907.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/generac_pressure_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/4710288992.pdf
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/gopagisas.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/xeguras.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_off00004fd9.bin
526da40c391ea76e1882fc3ddac221f0f6fff6ee1e4a52bbb7cd423b0be4a07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD9 5352 bytes
font_01_sfnt_off000061e4.bin
99b1b8c0b563c772e374863d65bf88cf5ff9c42a1c41b5ab7875132f6f6be144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E4 13088 bytes

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