Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca5a92219237048…

MALICIOUS

PDF

68.1 KB Created: 2020-12-28 01:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f116e0dde15909976bd661fbe2d2a21 SHA-1: 47c70628518ba6df1140e6b3eda17caa1b3636cb SHA-256: 4ca5a92219237048c333cf3622c978a0ccfd1a27aae607fd21144def0b92acbb
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary links directs to 'trafffi.ru', suggesting a potential attempt to drive traffic or distribute further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure and link farm suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?utm_term=pixel+gun+apocalypse+3+unblocked+76+ez
    • https://cdn.sqhk.co/zexukobesu/RYY1dts/highest_score_in_bowling_strike.pdf
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fab5027e5782.pdf
    • https://cdn.sqhk.co/tezikegoj/jcjcRX1/59524166634.pdf
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fe8e3df6435b.pdf
    • https://cdn.sqhk.co/fagesupuwe/ij1igwh/gikugefuvonikam.pdf
    • https://cdn.sqhk.co/mivesumor/jdiaAia/velocity_rush_parkour_action_game_hack.pdf
    • https://cdn.sqhk.co/muruwake/jgjhjjc/miami_skydiving_center_reviews.pdf
    • https://cdn.sqhk.co/zotipimesaza/igiaicK/jefopavexesoto.pdf
    • https://cdn-cms.f-static.net/uploads/4485587/normal_5fe8826a40683.pdf
    • https://dukilasurijase.weebly.com/uploads/1/3/2/8/132815907/99ae1c008e.pdf
    • https://cdn.sqhk.co/pimibopugugo/nihccia/best_80s_songs_playlist_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/85e4f397-c2a4-44ad-a67f-4f147c82c70f/under_the_black_sun.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/10391272488.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c05d.bin
4e4183ef93f49ab704ba34cb5998b61ec684fb42b62fad3cdd8e46823b686cb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC05D 5768 bytes
font_01_sfnt_off0000d41a.bin
d123f1a7b94908bdcec673df0ef18f5596053dc2c034c76381ade0ec5faf8196
pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 9784 bytes
font_02_sfnt_off0000f594.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 4324 bytes