Malicious PDF — malware analysis report

Static analysis result for SHA-256 898d527005140b3f…

MALICIOUS

PDF

43.1 KB Created: 2020-08-06 04:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05fe92c835320d2ca44cee9a40499b63 SHA-1: 889e0b9bf7536376b70c83194b79924446878fd7 SHA-256: 898d527005140b3f8ef4301320ec4ca53190b1086caf94d491e7113b4061467a
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to external PDF files. One of the primary URLs, 'https://ttraff.ru/pify?keyword=exercice+avec+correction+de+l+amplificateur+op%25C3%25A9rationnel+pdf', is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious content through a link farm strategy, likely for phishing or malware distribution.

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=exercice+avec+correction+de+l+amplificateur+op%25C3%25A9rationnel+pdf
    • http://files.shoanlo.net/uploads/1/3/1/0/131070561/kowuladusixevi-buzukavobedeze.pdf
    • http://files.paulhorsman-author.com/uploads/1/3/0/9/130969184/5bd23719d759.pdf
    • http://files.americanbbq.co.uk/uploads/1/3/0/8/130814387/1e22952ba0e.pdf
    • http://files.maskandbauble.org/uploads/1/3/1/4/131407214/donosaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/batman_the_killing_joke_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6140/files/35723783764.pdf
    • https://cdn.shopify.com/s/files/1/0437/3214/0186/files/30248752094.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/tinkers_construct_draw_speed.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/87836754594.pdf
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/vurewovofedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0875/files/neseberemafijejenekuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/4170/2567/files/lovetixavatunotus.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2978/files/kiferuzutamomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/buvuzizesanelura.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_off000065b2.bin
ee22f16f6a0c25bd306c19da8405529595f418ee57658765e299c023c5612bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x65B2 5348 bytes
font_01_sfnt_off0000779d.bin
d223aac30972f0c67cf890bd8a6abb0ca0804dd69401be4d188b776d0dc718e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x779D 11824 bytes