Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce12a4a31e6f0895…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 03:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2c72c9ccf6185993f8297233f9cc3e9 SHA-1: 4c1f0de4fa8c2ffec585f2a6ca9a8715c4ccf055 SHA-256: ce12a4a31e6f08953c883355781e48ff9866128c8757c443311363995ce5adfc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector at 'https://ttraff.com/pify?keyword=principios+de+instrumentacion+quirurgica+pdf'. Another critical heuristic identified a large link farm pointing to various PDF files, many hosted on Shopify domains, but some on suspicious domains. The ML classifier strongly supports the malicious nature of this PDF. The document body text, though garbled, contains the suspicious URL, reinforcing the lure.

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.com/pify?keyword=principios+de+instrumentacion+quirurgica+pdf
    • http://mevakeke.credit-hours.com/uploads/1/3/0/8/130814328/db19873f3.pdf
    • http://tukak.teachart-hardy.com/uploads/1/3/1/3/131380213/1779047.pdf
    • http://files.ccsasoccer.org/uploads/1/3/2/6/132681296/1ca9c2.pdf
    • http://files.ngbeautymakeupstore.com/uploads/1/3/1/4/131482886/8197787.pdf
    • https://cdn.shopify.com/s/files/1/0430/0754/1401/files/lurudewapanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/73897264601.pdf
    • https://cdn.shopify.com/s/files/1/0439/0292/7003/files/bowirupekopibisekud.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/62667104540.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/55039828581.pdf
    • https://cdn.shopify.com/s/files/1/0447/3896/9749/files/mexutizukojaxazasutal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/diabetes_mellitus_type_2_books.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/buzz_aldrin_return_to_earth.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1232/files/kerarazamumijagofuxiniso.pdf
    • https://cdn.shopify.com/s/files/1/0435/8576/5535/files/11809358484.pdf
    • https://cdn.shopify.com/s/files/1/0452/4238/4545/files/html_to_linux.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_off0000648c.bin
7ec47eb8dc49d8d15532b890fa4bc562b3f9c2aa494c323802f362980924c662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 5572 bytes
font_01_sfnt_off00007754.bin
85f1aacbb1ecd6fcef4e79738b9ff87ac2430dafe28b4370702e96d9d4a4a78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7754 10908 bytes

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