Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfa7975ac4325b6…

MALICIOUS

PDF

41.0 KB Created: 2020-08-25 09:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ac3ca0418fa24fd53aabbf835d734e SHA-1: 5753e32c423e420fd4c35f4654e9610d3357ac67 SHA-256: 9bfa7975ac4325b6a7ef842845702d43fabcd84dda5e6ae3d06a96da8c2df1ad
150 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 one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely designed to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm and malicious redirector are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=french+alphabet+in+english+pdf
    • http://files.projectintensity.com/uploads/1/3/2/3/132302855/vukag.pdf
    • http://mofigiwiv.creativideeworkshop.com/uploads/1/3/1/3/131384495/tulufuwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/minecraft_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0446/6386/5497/files/assessing_reading_fluency.pdf
    • https://cdn.shopify.com/s/files/1/0429/2267/2284/files/mowimurixazokola.pdf
    • https://cdn.shopify.com/s/files/1/0461/7548/6115/files/31394782321.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8102/files/geribeke.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/60600643611.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/kizapufoxuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3141/files/jidozewumixapuzu.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_off00005bcc.bin
cafa82a423f922aa96c81f47c131c2e601e7a8ab7d78372bee3e7e66cff4a826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCC 5512 bytes
font_01_sfnt_off00006e6d.bin
73a14306a565309abbd41f8e8f6169b918ec67057a2194b418b5b50204561df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6D 13100 bytes

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