Malicious PDF — malware analysis report

Static analysis result for SHA-256 42649965dded5aa6…

MALICIOUS

PDF

43.6 KB Created: 2020-08-15 07:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfcbae96b19fa28c3b032d876a0d38a2 SHA-1: 3ba3c15bb84d328bf7ef21db8704561d8aabfaef SHA-256: 42649965dded5aa66f3eeffdbfcce0d57faaa5c98c6ddfd90bd9dd270dac28d7
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/wb?keyword=aldehidos%20y%20cetonas%20pdf%20unam, points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains a mix of text and what appears to be binary data, making it difficult to ascertain a specific user-facing lure.

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/wb?keyword=aldehidos%20y%20cetonas%20pdf%20unam
    • http://files.dbm-rc.com/uploads/1/3/1/1/131164394/lowewanudunux.pdf
    • http://files.bcimc.info/uploads/1/3/0/7/130776611/d8fc9c42cce49e.pdf
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/42693507835.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/biblia_holman_de_estudio.pdf
    • https://cdn.shopify.com/s/files/1/0439/9346/4990/files/free_weight_loss_trials_with_free_shipping.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/beyond_the_aquila_rift_the_best_of_alastair_reynolds.pdf
    • https://cdn.shopify.com/s/files/1/0436/7450/1285/files/61914477118.pdf
    • https://cdn.shopify.com/s/files/1/0445/7041/1172/files/menewazo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9730/6776/files/lexedepijesafimob.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/88130193849.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/35729731455.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0922/files/15356387591.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3624/4118/files/mebaroxolixavinirosudaruk.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_off000069c9.bin
aba154672141f1bcee301e3cc44a523d56ee94339022d9b48b39876fab8afe5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C9 5392 bytes
font_01_sfnt_off00007bfb.bin
941ccd68dd015f966c7f6eabce722e93aa1125adf6584a840533f165a0d86c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFB 11088 bytes

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