Malicious PDF — malware analysis report

Static analysis result for SHA-256 0975d418add0a944…

MALICIOUS

PDF

70.8 KB Created: 2020-08-02 13:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c2c53d8589771bfae4fb09b8e7f778c SHA-1: de41d216723d2bf67e6c6e67782f68299515ae3d SHA-256: 0975d418add0a944bb3cc06230539fbf771c605ce9978a5fab90d4442298014b
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 pointing to what appears to be a link farm or redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=pert+test+study+guides`. The document body, though heavily obfuscated, contains references to study guides and the URL, suggesting a lure to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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=pert+test+study+guides
    • http://files.dinytots.com/uploads/1/3/0/8/130874240/pazor_lomar_vemekefona_nawelipovuve.pdf
    • http://files.rotowiper.com/uploads/1/3/1/4/131453574/papaloto.pdf
    • http://files.plasticproductionallc.com/uploads/1/3/0/7/130775652/nadoki-wonodesaxulurag.pdf
    • http://files.a1moments.com.au/uploads/1/3/1/4/131407148/f1cb1e3ca65cf3.pdf
    • http://files.missycampmusic.com/uploads/1/3/0/7/130775592/zotikelujotuwuxev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/dutiwovakuvefav.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/70748023457.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/mekovuwuvibifemebokesiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2103/files/bobcat_753_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7441/1926/files/59637783782.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/97497312148.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/kagifi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/40110970180.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/dovebavisetewibajod.pdf
    • https://cdn.shopify.com/s/files/1/0434/7117/5832/files/ruduzenizarugitetimufiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/6251/0236/files/sajevebasedozip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suxuteregejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/47199347651.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8311/files/62710023322.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_off0000d417.bin
784fcbc39f0c90608a63532c51a2a5d28af77b9b5efee597f091e5aaf66af378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 4852 bytes
font_01_sfnt_off0000e4b2.bin
64f8690876d85483585a04910697e81ec80be40d84abd957f513c25a5a762346		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 12944 bytes

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