Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa907f091758cb2e…

MALICIOUS

PDF

43.7 KB Created: 2020-08-28 17:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce88e9048dc971131e788d796b082102 SHA-1: ffeb08cb85c010f43114f796224eace3e662ec19 SHA-256: aa907f091758cb2eb857f6b7d6d453c13daf4ce69ac73f8a0f0735ad3c23509a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution

The PDF contains a significant number of embedded links, identified as a link farm, directing to various PDF files hosted on external domains. One of these links, 'https://ttraff.club/pify?keyword=stephen+king+sun+dog', is flagged as a malicious redirector. This suggests the document's primary purpose is to drive traffic to potentially malicious or SEO-manipulated content.

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.club/pify?keyword=stephen+king+sun+dog
    • http://files.wineworldcup.co.uk/uploads/1/3/1/4/131406527/9715972.pdf
    • http://gelavubej.impartalliance.org/uploads/1/3/1/4/131407592/beduzewizoveges_tuxeganupon_vozijib_moguxijuwur.pdf
    • http://files.mx.thomasmadden.org/uploads/1/3/1/4/131437457/kavituvavotugaz_babefuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/xowamavexidodedetereg.pdf
    • https://cdn.shopify.com/s/files/1/0457/3619/8300/files/zozalulefaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/95088358899.pdf
    • https://cdn.shopify.com/s/files/1/0432/5199/0691/files/how_to_get_prop_hunt_on_gmod.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/sales_negotiation_skills_training.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/dd_form_368.pdf
    • https://cdn.shopify.com/s/files/1/0433/9132/0229/files/nogapuwaduxir.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/biological_science_scott_freeman.pdf
    • https://cdn.shopify.com/s/files/1/0436/4346/9974/files/90102220982.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_off00006d34.bin
410399b570e16a68fcada904b7773de9a38557b2db455cfecb8f2087b7ce859f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D34 5052 bytes
font_01_sfnt_off00007e66.bin
83de969757b025497f068539fe571a7d94c24f302119a0e2cd3dc02f0d6b1d62
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E66 10392 bytes