Malicious PDF — malware analysis report

Static analysis result for SHA-256 3794b52ddfaf1939…

MALICIOUS

PDF

45.3 KB Created: 2020-08-13 21:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199dd9f63b34af4a5b8ef0cb800e7a32 SHA-1: d671b47f05e7baafee103dfc71e3b34936f8a40e SHA-256: 3794b52ddfaf1939f9cd37b03042413a7da6cc52169893efe7f9e1a59fc64363
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains numerous external links. One critical heuristic identified a redirector link pointing to 'ttraff.ru', which is known malicious infrastructure. Another critical heuristic indicates a link farm, with many of the links pointing to Shopify domains, likely used to host further malicious content. The document body contains garbled text and embedded URLs, suggesting it is not intended for legitimate user consumption but rather as a lure for 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=sistema+respiratorio+superior+pdf
    • http://jidotekiw.brandynacole.com/uploads/1/3/0/7/130738732/rewixusudunazi-nisiti-fumebugu.pdf
    • http://files.envsalongrantspass.com/uploads/1/3/1/8/131871614/da0157262.pdf
    • http://files.olenaluggassi.com/uploads/1/3/0/7/130740563/nuxitolubefiletoniw.pdf
    • http://rujiwexav.churchbestpractices.org/uploads/1/3/0/8/130814297/7749660.pdf
    • http://files.daniellebschwartz.com/uploads/1/3/1/4/131437018/742b04f69a.pdf
    • https://cdn.shopify.com/s/files/1/0428/6778/5884/files/nuzuduredajidekuwumeko.pdf
    • https://cdn.shopify.com/s/files/1/0437/7732/7265/files/83873516782.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2346/files/verbal_ability_and_reading_comprehension_by_ajay_singh.pdf
    • https://cdn.shopify.com/s/files/1/0430/1189/9551/files/2020_telugu_calendar_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2535/files/abstract_algebra_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8663/files/35012592884.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/fapeteximaravokimawisez.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9589/files/18445526990.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/castlevania_symphony_of_the_night_bradygames_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/jipilezakaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1989/files/19312007726.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/java_language_basic_concepts.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_off00006588.bin
c47328b99d1a8106722297ddf3976446a0c29354b3be907203f77db8ad888c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6588 1684 bytes
font_01_sfnt_off00006ded.bin
1629c26f3ae97a27d5cdb7741fa84639dab80495774f54136fa2127cc6090f24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DED 5256 bytes
font_02_sfnt_off00007fa9.bin
49c1e71352546f98c1a5c5aa9239a712d8b366f12f7855a1ec66ca6c65b87dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA9 11860 bytes

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