Malicious PDF — malware analysis report

Static analysis result for SHA-256 85817bf7ab5ed545…

MALICIOUS

PDF

52.4 KB Created: 2020-08-17 15:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdfdd7b106dbb33bc5520c5f83a41fd0 SHA-1: 718c1811d02e795c55eb0a25ccc31b6e2d0272be SHA-256: 85817bf7ab5ed545f0672a94a6ebb015d1690a82b29fa93b2ac39e567d86f365
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 26 external PDF links, with one link pointing to the known malicious redirector ttraff.ru. This suggests the document is designed to lead users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users.

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=beema+audio+song
    • http://files.dustyhikes.com/uploads/1/3/0/8/130874101/78747c273.pdf
    • http://files.mare20.com/uploads/1/3/0/7/130738852/594678.pdf
    • http://files.jodileeart.com/uploads/1/3/0/9/130969938/sokovobavitika_nopaxewavaromix_menebeketo_maxujaputes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/fimusaxegumedobodefuma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/minirefotapobizezuloxot.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1731/files/relief_carving_wood_spirits.pdf
    • https://cdn.shopify.com/s/files/1/0447/2075/0745/files/heart_pieces_twilight_princess.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4567/files/96818551654.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/les_infortunes_de_la_belle_au_bois_dormant_ekladata.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/xiriduwizejajozuveritiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1045/6730/files/minecraft_fairy_tail_servers.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/pevinofixoxebokekisuri.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/kekoza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a45.bin
b49c0cf8c6dbe063ce9df81cbeedc81e9b92a71d31e66bc28dbc9cd1445f5c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A45 5064 bytes
font_01_sfnt_off00008b6b.bin
4a40d34d6432639f5dbf1a0557cd134c6fa48a110cc460b99a6bc7bb07d0ae0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6B 10476 bytes
font_02_sfnt_off0000af8e.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8E 16164 bytes

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