Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67412c529b0d2c7…

MALICIOUS

PDF

57.1 KB Created: 2020-08-11 17:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf76cb3fe95b767f5dbde25d021acc2 SHA-1: 83d8924876500fc3387d985636450997f814945d SHA-256: c67412c529b0d2c7464c0ffd923dece5832834246d11cba7e36b2eb72b84b473
152 Risk Score

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, ttraff.ru, which is disguised as a search result for a legal topic. This indicates a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the malicious URL.

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.ru/pify?keyword=difference+between+void+agreement+and+voidable+contract+pdf
    • http://guzotofu.coasttocountrycustomfurniture.com.au/uploads/1/3/2/6/132681231/besajexiragobu-bamulaju-zunerovovuwab.pdf
    • http://files.kapsi-cac.com/uploads/1/3/0/9/130969920/0a4a7.pdf
    • http://files.bradysbendhistoricalsociety.org/uploads/1/3/1/6/131636651/fewegejodolip.pdf
    • http://files.centerforburmastudies.com/uploads/1/3/1/1/131163782/4932208.pdf
    • http://guzotofu.coast
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/lilunatupaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6097/files/xinorasowusigedipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/ffxi_dnc_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/23012186766.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5871/files/lactational_amenorrhea.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5738/files/joel_chadabe_electric_sound.pdf
    • https://cdn.shopify.com/s/files/1/0437/5429/1354/files/hindu_calendar_2020_october.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/belukigazu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3971/7538/files/55715526338.pdf
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/o_reilly_oracle_books_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/silif.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/74059713330.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4366/files/13666650250.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092a4.bin
74c1eb0b6fdb5f9804f35a6bfd593cf6d8adbc35a89cb2fcb53d9baf7a2bbaeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92A4 5376 bytes
font_01_sfnt_off0000a4e9.bin
8b12293d1ca0daba6901aa80be5a50a0e9e03faef2a1b479a3e03d1438d51e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E9 10376 bytes
font_02_sfnt_off0000c851.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC851 4324 bytes

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