Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4a7d16d93fe5c2…

MALICIOUS

PDF

49.1 KB Created: 2020-08-08 08:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 369639b2fd3a364c01127fb13c664bd6 SHA-1: 43b627368a50f9feb1f83f45753df0d8537d48f0 SHA-256: 9f4a7d16d93fe5c229d7d612fad5875f4335dd77acc7bfbc4c2d4e9980a8cb0a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=accounting+rules+pdf+in+tamil'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0436/9596/4328/files/sidogubosugit.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, reinforcing the lure.

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=accounting+rules+pdf+in+tamil
    • http://files.romeosinmercersburg.com/uploads/1/3/0/7/130739831/mojorogabadebe_fabeforof_wuvagesuli_vivarafijewekab.pdf
    • http://peruzarun.cc-tutors.com/uploads/1/3/0/7/130775162/nabujum-jevuzoru-kurikumifuko-vokumesene.pdf
    • http://files.unpathedwatersandundreamedshores.com/uploads/1/3/1/1/131164308/salavuzodi.pdf
    • http://files.mathlinksedu.com/uploads/1/3/2/6/132695430/da83c7.pdf
    • http://files.swiftmotorhomesownersclub.co.uk/uploads/1/3/2/3/132303312/2084215.pdf
    • http://peruzarun.cc-tutors.com/uploads/1/3/0/7/130775162/nabujum-jevuzoru-kurikumifuk
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/sidogubosugit.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/22221953040.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/naxutupululupawobut.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/93095159254.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/papixusisijipe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4021/6987/files/bruchrechnen_gemischte_aufgaben_mit_lsungen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78491346320.pdf
    • https://cdn.shopify.com/s/files/1/0429/8758/5699/files/86043602836.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/acrobat_reader_editor_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/aggregate_planning_in_supply_chain.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/93704691769.pdf
    • https://cdn.shopify.com/s/files/1/0440/6745/5128/files/najen.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_off00006bc3.bin
b7e27a2feffa47769904c50f12d029742b95dfa3e222b7f388f9d41d64c07c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC3 5464 bytes
font_01_sfnt_off00007e4b.bin
02634b40f2dff80cde5f5da374625af440de9dd79711b1f4f6817f9a6bba3a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4B 10312 bytes
font_02_sfnt_off0000a18a.bin
988a316f543fb787c6e548b45acc8bfd59cad13da049e9ddbad57dfbfbb9e7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA18A 16120 bytes

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