Malicious PDF — malware analysis report

Static analysis result for SHA-256 735c15c03e7b6646…

MALICIOUS

PDF

53.0 KB Created: 2020-08-03 08:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea96fe16e947f4437b659caaa0a8732f SHA-1: eca2a0ce6819c872450f20c02b554c2e2529ded0 SHA-256: 735c15c03e7b66461d066965bdcd7ae8340ce9fadadb012acabb2a2245362cd9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to known malicious redirector infrastructure (ttraff.ru). The document body, though heavily obfuscated, contains text suggesting it is a study guide, a common lure for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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=praxis+ii+general+science+study+guide+pdf
    • http://files.abideministryofarlington.org/uploads/1/3/1/4/131483423/mufibavuz.pdf
    • http://files.kumisillustrations.co.uk/uploads/1/3/2/8/132815367/lebamavuwi.pdf
    • http://files.soundslikecrowes.com/uploads/1/3/1/8/131871518/2f6e86aea3ae0.pdf
    • http://files.womensquartermarathon.com/uploads/1/3/1/3/131379894/5485506.pdf
    • http://files.rebeccawalzteachingportfolio.com/uploads/1/3/0/7/130739131/koverejutu-kizebu-rimejapebutuku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/duponeduwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3117/4039/files/lujovijobaworowifiwuja.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/54368848510.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/mudegesofev.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/59895345696.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rimudunibodosugesujusuvud.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/suzewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/29371318788.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/13332719561.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/44957676088.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/nudugabojijavatepupax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/litajokeguxomimis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d0b.bin
749bb984a256ae10e3a69d63d9985793c8c7f3403b5f138dae0cfcf380323e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0B 5264 bytes
font_01_sfnt_off00007f07.bin
cbae75955ff476037dbbec00f5c0af0d9c2548dd28fd8e6a04f1c0d5533c7eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F07 10700 bytes
font_02_sfnt_off0000a3bb.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BB 16036 bytes
font_03_sfnt_off0000b823.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB823 4324 bytes

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