Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2fca526b07cd49…

MALICIOUS

PDF

43.8 KB Created: 2020-09-17 10:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3476ab7c714734d87966aaf8c40b4493 SHA-1: 43a598a7bdab045ee993a16b94e4f4dc3fe93ec7 SHA-256: be2fca526b07cd492eab67b28bd769ae5358982bc04365a223cf0e2effb05c87
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with at least one identified as a malicious redirector. The heuristic firings indicate a deliberate attempt to link to potentially harmful content, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=bare+bones+free+pdf
    • http://disowu.usesapsasa.org.au/uploads/1/3/0/7/130739127/mobake_tilozokijosaxa.pdf
    • http://files.sandraharveyphotography.com/uploads/1/3/2/7/132740836/5e39f1743c06d7.pdf
    • http://xedewas.rccwood.com/uploads/1/3/1/3/131380183/2059493.pdf
    • http://files.mayonakacats.net/uploads/1/3/0/7/130775108/5175033.pdf
    • http://radimaze.mankatocomedy.com/uploads/1/3/0/7/130740592/givolalezel.pdf
    • http://files.pawsforthoughtcatcafe.com/uploads/1/3/0/7/130775607/fizubesepuvinof_nirog.pdf
    • http://napiz.tokyohumanities.org/uploads/1/3/1/4/131453027/jizul.pdf
    • http://pepefide.mindthegapplease.org/uploads/1/3/0/8/130814017/6cbd3bb0.pdf
    • http://dojal.npnbuyer.net/uploads/1/3/1/4/131438177/makunerol_vewagegirixaf_baseses.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4459/files/multiplication_worksheets_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/9389/2008/files/basic_modern_calligraphy_alphabet_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/20809634029.pdf
    • https://cdn.shopify.com/s/files/1/0448/8049/4759/files/katametuzebodigeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/wezakawaxew.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd2.bin
4336bf7ea71ad8ad00afd9db31a9d67b26da6bae6e3bd3c67db714ef32639461
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD2 5192 bytes
font_01_sfnt_off00007f83.bin
535eeed6c2bab3bf704c874a6565458a7286f279d48ef583a03ba2862df9e33f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F83 10192 bytes