Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7f0e6f9b63ee51…

MALICIOUS

PDF

46.5 KB Created: 2020-08-16 14:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 094103a26024b3138bbba72a484084e4 SHA-1: 05d0f4abcf970e7f32ff6e13a6ac0d36c18b00ff SHA-256: 8c7f0e6f9b63ee51f6e06448fc8004930f18461a05c61517f1d778cd431de076
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a 'PDF link farm' heuristic. One of these links, 'https://ttraff.com/pify?keyword=phoneme+grapheme+mapping+template', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and other PDF links, suggesting a coordinated effort to distribute malicious content or manipulate search engine results.

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=phoneme+grapheme+mapping+template
    • http://files.cheltenhamconnect.co.uk/uploads/1/3/1/4/131409463/c3cd68d3751.pdf
    • http://files.albanyems.com/uploads/1/3/1/3/131381605/4094708.pdf
    • http://files.alanphillipsart.com/uploads/1/3/2/8/132815767/86ae301e9.pdf
    • http://files.sakinaliterarysociety.com/uploads/1/3/1/6/131606373/xoxuwujefixofan.pdf
    • http://files.powderkegfarms.com/uploads/1/3/1/4/131438641/5458890.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/99020433659.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/14048431300.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/47046682494.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/watchguard_software_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/21727675357.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/34750633909.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/72283068852.pdf
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/gewixodisameveka.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/muxob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/28573580647.pdf
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/video_kartun_lucu_wa.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_off000078b6.bin
0efb57d5b83f8b89935ec0f6f021c9b88783d13735f4fd3832545df8caa58bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B6 5056 bytes
font_01_sfnt_off000089bc.bin
f1b8fab21528af85bd625ec452f1cf7bbd813b9eced4439e92931f6aafd93d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BC 10120 bytes

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