Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95c502755ec772b…

MALICIOUS

PDF

38.8 KB Created: 2020-08-26 06:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9acec7f7dcd2f4d085daf4f3f34a6edf SHA-1: cc9d566297ffaaae6f31a01ac01a7518343f4bc5 SHA-256: c95c502755ec772bbcdf7c4feb84f152894366c9c634ed38c1ddae97ad416ac3
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a redirector, and the document body contains numerous links, including one to 'ttraff.ru', which is known malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a link farm.

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=shadow+spell+nora+roberts
    • http://files.foundthingsco.com/uploads/1/3/1/1/131164100/55f631f728512.pdf
    • http://zudowin.themovermalaysia.com/uploads/1/3/0/7/130776445/fekel.pdf
    • http://wiruwagi.heartworks.org/uploads/1/3/0/7/130740169/talexenone.pdf
    • http://files.alpenaoptimistclub.com/uploads/1/3/0/7/130775917/jamolem.pdf
    • https://cdn.shopify.com/s/files/1/0450/2175/7590/files/pugixi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/approximation_questions_for_rrb_po.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/nicomachean_ethics_w_d_ross.pdf
    • https://cdn.shopify.com/s/files/1/0429/7805/0201/files/pexibeniwemazax.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/pratidin_newspaper_amravati.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/94864005618.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/61082402645.pdf
    • https://cdn.shopify.com/s/files/1/0435/4588/6884/files/einstein_field_equations_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0433/8748/6358/files/regression_analysis_by_example_5th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5871/7087/files/belara_bula.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_off00005b44.bin
bb8bce160ed31f8b50a6dc7f022676276da9d90277f5e46b3229564bcd13e03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 5380 bytes
font_01_sfnt_off00006d8b.bin
83b0bb77198c302575a6b46c93c048f434783a37b04bf21e0d6dbc01cc0384de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8B 9568 bytes

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