Malicious PDF — malware analysis report

Static analysis result for SHA-256 383ecb1c7d6f4269…

MALICIOUS

PDF

31.8 KB Created: 2020-08-06 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab5983ba151a59d2ddb404ad7543cdb2 SHA-1: a06b14686c454648740225e19513b11618f178c1 SHA-256: 383ecb1c7d6f4269d1541fc9a448c687933be83904a80a8002a2485d4070aee6
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a book download. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=boundary+element+method+book+pdf
    • http://files.designtimegnc.com/uploads/1/3/0/8/130874587/pogerujumi.pdf
    • http://files.mountainvalleystudios.com/uploads/1/3/1/1/131164273/2306d.pdf
    • http://womeb.ericbrittmusic.com/uploads/1/3/2/3/132302872/kogapak_mukisanukugu_xupoxekaxubuko_mupezir.pdf
    • https://cdn.shopify.com/s/files/1/0437/7097/0274/files/ledorerifadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/23590961905.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/wufopuxepaloparegi.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/wafupixeba.pdf
    • https://cdn.shopify.com/s/files/1/0440/6873/3078/files/zozawipelajofuponefa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/rebokejevozabovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9879/files/desi_hits_movies.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/sipufexijesug.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/js_force_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/gixeforirovefinosulewe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/zinoludeponatamomokej.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/nolemuseni.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_off000041f0.bin
7900158ea2b8d7238d26b2580ddc7a9a8ac70baaa29a901c53428fcd674ce257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41F0 5456 bytes
font_01_sfnt_off0000545c.bin
26996427916952a47eaf2a6e46d142b2d595e778e9f3afba3b8d86923a7c3f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x545C 8768 bytes

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