Malicious PDF — malware analysis report

Static analysis result for SHA-256 8103a9f4e3f7a86e…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 19:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bcd2e2e19897964c7432f5aaba9b380 SHA-1: 162bd057ccfa28e82b2c4391b241fe70f03a9f60 SHA-256: 8103a9f4e3f7a86e52b3983694c7bfe19ea477fb70a330cd7214574438fb2f27
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL, https://ttraff.ru/pify?keyword=yulgang+global+mobile+guide, is presented as a guide for a mobile game, indicating a social engineering lure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded link farm and 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.ru/pify?keyword=yulgang+global+mobile+guide
    • http://gafusib.iglesiapiedradesantuario.com/uploads/1/3/1/4/131407668/4b0c381d2109.pdf
    • http://files.room15ccc.com/uploads/1/3/1/4/131452861/gaxibavi.pdf
    • http://files.daydreambakery.com/uploads/1/3/1/4/131408432/796f9f6.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/59503480634.pdf
    • https://cdn.shopify.com/s/files/1/0431/7442/8829/files/introductory_chemistry_nivaldo_tro_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/1287/4662/files/algebra_1_exponential_functions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/32643645466.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/farawikuruvadagodabomaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/zarakajomapobivetototudu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/accellion_plugin_for_outlook_2016.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2279/files/90227526731.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_off00006bf0.bin
f80535eeb076016ebe45a25efd40f4759e03c2102a7d36c622c89be8113bebdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF0 4972 bytes
font_01_sfnt_off00007cc6.bin
9fb45af9e57870e62cf29b2c70b25a024d601a3a23e637151dacb0c7f130683d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC6 9680 bytes

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