Malicious PDF — malware analysis report

Static analysis result for SHA-256 023f48f6aaa63a9b…

MALICIOUS

PDF

41.7 KB Created: 2020-08-02 22:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1637d489c8e0e60e5eb5028e279e77be SHA-1: a8d96fa292f1cc0e1c88009675f7018cec49816f SHA-256: 023f48f6aaa63a9bad161c158b0509003f690f0856d066252fa676d1277d6713
154 Risk Score

Malware Insights

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

This PDF document contains a mass of external links, including one pointing to a known malicious redirector at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains the same URL and other benign-looking PDF links, suggesting a lure to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious redirector links.

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=witcher+3+succubus+decoction
    • http://files.jingergustafson.com/uploads/1/3/1/4/131453402/7719565.pdf
    • http://files.lauraduggantherapy.com/uploads/1/3/2/6/132683181/zakesanulop.pdf
    • http://files.tue-wai.com/uploads/1/3/0/7/130739239/wivigawamanaro.pdf
    • http://files.paulfield.com/uploads/1/3/0/9/130969905/6573293.pdf
    • http://files.marinersguide.info/uploads/1/3/0/7/130775959/178d2ae253d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/22218114886.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/5_day_notice_cook_county_illinois.pdf
    • https://cdn.shopify.com/s/files/1/0435/1305/3338/files/discord_bump_bot.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/nordictrack_audiostrider_800.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/92743398153.pdf
    • https://cdn.shopify.com/s/files/1/0432/0205/2257/files/fodin.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/dejidonotezabarirebufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/sosox.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/98598580071.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/rumumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/nejakip.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/xadowokorapowimamapalagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/loxoginutojutig.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_off0000668f.bin
3765d94cd3065c214e73d2fd6fe28db331f72e0bf4e3ece3283e50f1763b31fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 5100 bytes
font_01_sfnt_off000077ee.bin
4a6acef138eb4228cdde8246a64dc3075e4483b44928065fcec45e685c49ebb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EE 9984 bytes

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