Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b5a7af8120beb8…

MALICIOUS

PDF

40.6 KB Created: 2020-08-17 10:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e10591411757d76916123d3a5e6004 SHA-1: 843e9edd41816ab2c9d03eacff80deae56a9661f SHA-256: 99b5a7af8120beb8b014b1fe66123545d1cccf5c8dde9c42ef2480e1c19fedb1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. This indicates the document is designed to redirect users to malicious content. Additionally, a PDF link farm heuristic was triggered, suggesting the document is part of a larger SEO poisoning or link farm operation. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=chemically+competent+cells+transformation+efficiency
    • http://files.jasonmedinatribalpublications.com/uploads/1/3/2/6/132696145/jibaleror.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/4102292851.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/robubuxinam.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/davorurotewoduw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/787954521.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/16460523331.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/1464371656.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/fujefumogupufajifitupuweg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/ladevosuwijirowiwegogosuf.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_off00006074.bin
a607294b6c8e652f3f4ca1958773eba7f4779176d02135e4522d8379a0ab2b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 5260 bytes
font_01_sfnt_off00007232.bin
98cf91446a8b1b2bc8d037d64d2d493af3cbb11f4991eefcca761c1a6877dc60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7232 10492 bytes

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