Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3cd85fbbc3e6b1…

MALICIOUS

PDF

287.0 KB Created: 2020-08-04 19:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda49d742b3578acea3a58b51186980c SHA-1: 662b7cf2aa22a077ac2b3762ca0b3c8b23b54bb2 SHA-256: 7a3cd85fbbc3e6b1330722a0c00103c91d7184be7e1213b6afb462ecc723fda6
94 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL in the document body, 'https://ttraff.ru/pify?keyword=livre+algorithme+exercices+corrig%25C3%25A9s+pdf', is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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=livre+algorithme+exercices+corrig%25C3%25A9s+pdf
    • http://files.northshoremandarin.com/uploads/1/3/1/3/131381046/pivilix-zegezo-gefebafidaz.pdf
    • http://files.bmifitness.ca/uploads/1/3/0/7/130739239/bdacce39.pdf
    • http://files.thefriendshipcentre.co.uk/uploads/1/3/1/3/131384300/07f24192d860.pdf
    • http://files.robertomaldonado.com/uploads/1/3/1/1/131164176/6942357.pdf
    • http://files.premiergoldendoodles.net/uploads/1/3/1/8/131871488/tonebejetux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/99980625103.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/twitch_sub_count_emotes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9347/3947/files/xikaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/lutaja.pdf
    • https://cdn.shopify.com/s/files/1/0446/4692/4451/files/bowflex_xtl_workout_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0791/files/paxazitifona.pdf
    • https://cdn.shopify.com/s/files/1/0439/2127/7096/files/solving_compound_inequalities_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/xaluzenifaxatinivifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/constructing_dilations_worksheet.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_off00042169.bin
9e742ca6c37969d52ec2920f613a4972f6bbfbec4e563860cf82e7a0e54e86cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x42169 5780 bytes
font_01_sfnt_off000434b9.bin
362fa11d7bf3ed2bcb45c6839512eb4e4e4dc3809356425f1f03587a8a92f267
pdf-font-stream PDF embedded font (sfnt) at offset 0x434B9 18864 bytes