Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d11f6d6396e17f0…

MALICIOUS

PDF

40.0 KB Created: 2020-08-26 21:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18e950be34b83f49c180acdb318e3670 SHA-1: e93c084f5ba78e1c5e249e95510aeae8859bf980 SHA-256: 9d11f6d6396e17f0460394093c9d5a90c0e2c372683341482a99fdb920bfc85f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.com/pify?keyword=kenshi+faction+map', points to a known malicious redirector. The document body also contains this URL and other links to PDF files hosted on Shopify, suggesting a coordinated effort to direct users to malicious content. 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=kenshi+faction+map
    • http://files.g-publica.com/uploads/1/3/1/4/131408204/47170148d7f7.pdf
    • https://cdn.shopify.com/s/files/1/0440/9124/4696/files/bibliography_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/59187669996.pdf
    • https://cdn.shopify.com/s/files/1/0436/4497/7305/files/uidai_acknowledgement_slip.pdf
    • https://cdn.shopify.com/s/files/1/0434/8608/5277/files/comment_apprendre_le_chinois.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/boxed_light_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/2996283436.pdf
    • https://cdn.shopify.com/s/files/1/0429/1297/2963/files/titipazenarupeboxef.pdf
    • https://cdn.shopify.com/s/files/1/0454/8486/7736/files/certificate_of_origin_form_aifta.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_off000060b4.bin
e85bcff8a6884d5416d94e4e0dfce6cb30afce67bfe4a46c40479b045c682c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 5096 bytes
font_01_sfnt_off000071e7.bin
854018f3641ae77d0ed81feb5ddfb37cfa0ae55b3b678cbdc43d9be31af195a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E7 9896 bytes

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