Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a61c91f758673d5…

MALICIOUS

PDF

41.4 KB Created: 2020-08-05 17:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3da69ea16121c4d01417ea66395ee80d SHA-1: 11d2d681b6aa492ef05f588fbc8c7ce6ee035c42 SHA-256: 5a61c91f758673d5812e94a766d71d24acc5a90fbb62f7b444b5723a8b8801a0
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 external resources, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=brain+teaser+interview+questions+answers+pdf`. The document body, though heavily obfuscated, contains this URL and other links, indicating a social engineering lure. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence suggest malicious intent.

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=brain+teaser+interview+questions+answers+pdf
    • http://files.bulkleyvalleyhoney.com/uploads/1/3/0/7/130738803/gujugowop_fapizonepoke_gesoted.pdf
    • http://files.orchid-avenue.net/uploads/1/3/1/4/131406507/1878630.pdf
    • http://files.straleystudios.com/uploads/1/3/1/4/131438175/palozilinafilesi.pdf
    • http://files.fibonaccimotors.com/uploads/1/3/1/4/131438228/kasug-mogamonamikiba-zuziwuvof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7344/5788/files/wekikojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/waminikusuzifanar.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/rogudif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/14169295643.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9443/files/cod_waw_zombies_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7956/4448/files/mavajoxusezik.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/sefujif.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1575/files/88030520903.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/90417392092.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/nufukuvovuge.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/29773872087.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4604/files/sentence_fragment_checker.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/73402142193.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_off000063c9.bin
de7fd5040f30242001126f4e667341aeae8769cb246f2860aaf23d0c162afe13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C9 5328 bytes
font_01_sfnt_off0000760f.bin
36eb05c3ff7bd9f85c4a6c99b93889e38ef1a82aff401c0756c474871f10b560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760F 10012 bytes

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