Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef5b88c1122246d…

MALICIOUS

PDF

46.6 KB Created: 2020-09-18 03:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9bf97b0e8c120875e1f4c3c838dc53b SHA-1: 46bbf8f947853c33ca013e4e2a1731710221984c SHA-256: 8ef5b88c1122246d3148a39c2c201937696a6fd974e71de9cf032b2f3127d4f5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.link/wix?keyword=body+tissues+worksheet+colored'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to improve the ranking of the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=body+tissues+worksheet+colored
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/jebuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/the_astronomy_book_dk.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/nomopibitebudotam.pdf
    • https://6504320e-e4ee-4219-8f41-1b6227a4b550.filesusr.com/ugd/2b25b5_3d3e8527e7a043759ab4beb869cfdc66.pdf?index=true
    • https://4f894aa7-c336-415b-9c58-9d19322b0db8.filesusr.com/ugd/eb6c48_f8c30a7fe8424e118c7d2ef1110ee7a5.pdf?index=true
    • https://beb7b652-963d-4a87-bbac-db757bd8eba3.filesusr.com/ugd/7f614e_de495abfd7a0495f9693843179ca0eb0.pdf?index=true
    • https://62919c6f-54a9-4600-8942-a00636473590.filesusr.com/ugd/1715bf_a9445c309e9144b196357af09c94ae45.pdf?index=true
    • https://f9ccc76c-a0f8-4f41-889d-31a28615173a.filesusr.com/ugd/db93e9_84875dc1c7764b7ea4415cfc08fd2f96.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/22695045264.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/miwizopikofetegudebemuna.pdf
    • https://339e7c25-f2fd-4b1f-a636-1f8b421fd7f5.filesusr.com/ugd/6dcf04_b62998af1f8e4d84ba16a8f4a0909526.pdf?index=true
    • https://7e4812f2-c528-4381-935e-db8d02bc3d2f.filesusr.com/ugd/911c12_6aa84a5b1a8c42eb91f7baa882ba86dc.pdf?index=true
    • https://a7fd10d1-4d46-4d12-b4b5-97e1883b8834.filesusr.com/ugd/99b222_381750c1f7f64b6a8293255436dcf796.pdf?index=true
    • https://3b7e73fe-0238-4a27-94c1-b15f2305d344.filesusr.com/ugd/99a8f2_3bdb787a09044e12be51676be94d6992.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f3.bin
23b513e28161088c2fa432208e80c18b1ad7da2edad4aec0322e25557a01d142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F3 4900 bytes
font_01_sfnt_off000074d2.bin
621e31f27d3f4832fabc28b9767147a85ed7ef6eb353de84b9688120d243d87d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D2 13404 bytes
font_02_sfnt_off00009eee.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EEE 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.