Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfe50d68e923654…

MALICIOUS

PDF

42.3 KB Created: 2020-08-21 05:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a1146af60103aac6f6819bc4ead132d SHA-1: 746f29bfcf5d84440af975dd12c4eae40ff51f6a SHA-256: 0bfe50d68e92365451b02da940bf8c19041050fa157ac946218c8566be7186cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=english+language+learners+worksheets+pdf, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains references to educational worksheets and URLs, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=english+language+learners+worksheets+pdf
    • http://ditol.tamupsychclub.com/uploads/1/3/0/7/130775088/db34484b.pdf
    • http://files.thegloopsandthespecialplant.com/uploads/1/3/0/9/130969403/cae4d0f48e.pdf
    • http://files.infiniteaction.net/uploads/1/3/2/7/132712306/vosaka_pubemoxasonelob.pdf
    • http://sakiki.thesilvergoddessjoanib.com/uploads/1/3/0/7/130775320/badaxeweloditod-zatodanilinop-dixuwuxivewevi-vejijito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1135/8369/files/fallen_london_appalling_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/mudosug.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/75302565309.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/plant_cell_lab_onion_and_elodea_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/20761347060.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2771/files/37499223692.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/types_of_engine_in_aircraft.pdf
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/74048985284.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/80695707295.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/20732345455.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/introduction_to_game_theory_osborne.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b8.bin
c32e2f6f03b1c70e377543d258680d28cf0471f3b9ba3f4446bede1ab86b7ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B8 5416 bytes
font_01_sfnt_off00007932.bin
30bba6784a5f8e428ba32112ae6921a869240305e376d3438cb27e3609cc3476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7932 10288 bytes

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