Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c095b86c30c53e3…

MALICIOUS

PDF

44.0 KB Created: 2020-08-19 12:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b45590050be240257376721c37f62064 SHA-1: ff20c381bb90cb388c45ad2f31e9ca391fed6e23 SHA-256: 9c095b86c30c53e343b465b2fba11e4e7a82a75ae9102de387b240c1e8c93dff
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=drawing+contour+lines+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0435/2992/8863/files/basetiror.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'drawing contour lines worksheet', suggesting a lure.

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=drawing+contour+lines+worksheet
    • http://files.kielycup.com/uploads/1/3/1/4/131482919/lijijududik.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8863/files/basetiror.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/fomupiwizikujuziloxogut.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/velibigexiwumufivax.pdf
    • https://cdn.shopify.com/s/files/1/0438/3513/0018/files/biblias_de_estudio.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/poseteroxilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/how_to_round_edges_in_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/shipwrecked_vbs_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/4053/7750/files/sinister_secret_of_saltmarsh.pdf
    • https://cdn.shopify.com/s/files/1/0429/3145/4119/files/amando_a_pablo_odiando_a_escobar_completo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/jeperiwosazem.pdf
    • https://cdn.shopify.com/s/files/1/0448/0139/2801/files/al_nahar_lebanon.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_off00006e5d.bin
6923cf3bff749f2d2dbce63ad87a1c0a7340feac13d741e4fe53e5fd55edf864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5D 5216 bytes
font_01_sfnt_off00008028.bin
67f3bc73c5c5af9d77b9b2f7d3b939383e7ae5bb28c1e042e88c162ee84dc105		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 10408 bytes

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