Malicious PDF — malware analysis report

Static analysis result for SHA-256 9591e8edce9fa286…

MALICIOUS

PDF

52.5 KB Created: 2020-08-17 07:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce309a892cae0e2bf334be298971f07e SHA-1: 6273a499ec959e69fbd2e07580d6e7be46f0684a SHA-256: 9591e8edce9fa286f12ed3c322b38d4af23ecb9e09348b14b4618f8837ad2044
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. This suggests a phishing or scam attempt, using a seemingly legitimate document title to entice clicks. 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.com/pify?keyword=administrative+law+course+outline+pdf
    • http://jexam.doggiedogshop.com/uploads/1/3/1/4/131453284/zegata.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6279/files/gineriloxuxirifakazori.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/mivop.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/kali_rolling_repository.pdf
    • https://cdn.shopify.com/s/files/1/0438/2582/3904/files/68134424434.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/99273169803.pdf
    • https://cdn.shopify.com/s/files/1/0431/3491/0618/files/46372230651.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8359/files/70256332116.pdf
    • https://cdn.shopify.com/s/files/1/0440/1148/7397/files/satixer.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/reduction_of_relative_clauses_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/full_body_calisthenics_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1079/files/wutema.pdf
    • https://cdn.shopify.com/s/files/1/0429/3135/5807/files/dobeferaduxegej.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_off00008e36.bin
5e3164bb66bb412e279ca5cd6b31c406b93fbb300c4eb953d87c7741d21f473b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E36 5440 bytes
font_01_sfnt_off0000a0b1.bin
19bcb2f0838310bb8dd1ba8ec82786062faa28e44fe347fd9a0287a7a30eef1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B1 10792 bytes