Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f2daaa36e1614f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-03 14:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 988edf93040cea9ab32d8e0c284aafe2 SHA-1: f01968c730dfe244afac3bdbc2c55cf92d28e4c9 SHA-256: 27f2daaa36e1614f864d55ecd1c558d8e508c0ddd966ff68f48ffc676ba2d2c8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.ru/pify?keyword=ashokan+farewell+violin+sheet+music+pdf. The document body, though heavily obfuscated, contains references to the same URL, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=ashokan+farewell+violin+sheet+music+pdf
    • http://files.markbrayfineart.com/uploads/1/3/0/7/130738949/2571407.pdf
    • http://files.enaakshikotwal.com/uploads/1/3/0/9/130968996/serebo_tarivamewiro_tezunibedugo.pdf
    • http://files.staticcomputations.com/uploads/1/3/1/4/131437319/vekos.pdf
    • http://files.elpacaya.com/uploads/1/3/1/3/131384635/vatulupirutenupizov.pdf
    • http://files.ellistrations.net/uploads/1/3/0/8/130813837/93269c6cf63b26.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/53744789584.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/22197703238.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/pokavasijunezavajivum.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/tonula.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8214/files/34544391725.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vufofabiziterefabul.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/78282752639.pdf
    • https://cdn.shopify.com/s/files/1/0430/0960/5791/files/49601930065.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/79791375239.pdf
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/28939876546.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/95489403968.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_off0000585f.bin
ffb6efa4f671e0762d3af67289da2cacd5dd08b06455b3439a8c581833e7f231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585F 5600 bytes
font_01_sfnt_off00006b5e.bin
674d5e56d93ea38fc3a45fc63bdb0d52390cd989185ddc5ebe6f7ecde7853225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5E 15120 bytes

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