Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf3ff06cd047f0a…

MALICIOUS

PDF

40.0 KB Created: 2020-08-21 20:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6259c5f1d9a1d21086d402f14bae93a SHA-1: 57043beddc233a0a6bc22be727251790a50d6c38 SHA-256: ccf3ff06cd047f0a688c0e17683d228700f6bc2403c098502dcb5c5f73a31b40
150 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, specifically `https://ttraff.cc/pify?keyword=printable+monthly+attendance+sheet+pdf`. This link is presented within the document body, disguised as a benign file. The PDF also contains a mass external PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to blend in with legitimate traffic. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=printable+monthly+attendance+sheet+pdf
    • http://files.steeldaysaf.com/uploads/1/3/2/6/132681698/7566f48e46.pdf
    • http://files.rls-energynetwork.org/uploads/1/3/0/8/130874655/3de9daf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/17695817584.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/tunemevisomanemuremel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/lakapalatuxawivurosino.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/splinter_cell_chaos_theory_mods.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5352/files/most_important_english_words_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/25592385842.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/wijifafakudofigu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/sectional_aeronautical_chart_legend.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/50295492268.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/53233342779.pdf
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/zadedudebinug.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_off00005dea.bin
cb97abc40a8e59d3184435f9a955ea7a6d74a955a3f1de3c58702bf78a560111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEA 5640 bytes
font_01_sfnt_off000070e4.bin
a7ede42ba14325f3f3a086b98bb0f4c91c1e6d5aa9f065d8e5ee6ecb23dad16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E4 10120 bytes

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