Malicious PDF — malware analysis report

Static analysis result for SHA-256 155c21c4c0f9bec7…

MALICIOUS

PDF

49.4 KB Created: 2020-08-08 22:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aafb738ab7e28ab72247c9a39cdba94 SHA-1: e0f46b6cd9d8baab1976934d46513fae06bc6ffe SHA-256: 155c21c4c0f9bec76f8834961704f1396d06d3fed422550b1b366f2688eb42fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=genetic+mutations+in+humans+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.ru/pify?keyword=genetic+mutations+in+humans+pdf
    • http://files.andrewmowen.com/uploads/1/3/1/0/131070845/97f54.pdf
    • http://pagofuvi.wholeheartedlydaring.com/uploads/1/3/1/8/131871390/bififixusi-godibumofabusi.pdf
    • http://files.soaringeaglefitness.com/uploads/1/3/1/1/131163867/jenagiroxelet.pdf
    • http://files.victorkumar.org/uploads/1/3/1/6/131637919/jilofa_pevajuxaja_jepes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/modejuxuratisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/63914312039.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/sesepuvarezebibopololexob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0435/1413/4692/files/13481184463.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/lakibilutigevekapuwifil.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3475/files/37739952632.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fawalonilon.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/72328371153.pdf
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/big_papi_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0436/4438/7481/files/oxford_advanced_learner_dictionary_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0452/8229/5969/files/evaluacion_del_aprendizaje_significativo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/45765431345.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/jabejoli.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000836b.bin
231f280d7ecc370bbf3ff36bf7e7939fa23780833e4e1c31e8df030b880f3388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836B 5300 bytes
font_01_sfnt_off00009555.bin
4134c4f561e9298b9d4520813ed2851d2b72d0a1227c502488990ebcca6eb26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9555 10256 bytes

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