Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f979379b0298c2…

MALICIOUS

PDF

41.6 KB Created: 2020-08-10 12:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5981aa7855312eb5f07fabde3ef621f SHA-1: 58f6e1fd44bb7fc6e2288e75e4838e6ff24eee02 SHA-256: 66f979379b0298c264bca7066bb5e5ca5deb57d61d8ff41449ce69d484f74b2f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary purpose is to lure the user to this external resource. No scripts were extracted, but the presence of embedded URLs points to a redirection attack.

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=hemifacial+spasm+treatment+pdf
    • http://files.pillowstudios.com/uploads/1/3/1/4/131407351/noluzewimoxi_kurumonab_kexovajef_vapeduzixa.pdf
    • http://files.rayconant.com/uploads/1/3/2/6/132682204/034ee7.pdf
    • http://files.officevalue.net/uploads/1/3/0/7/130739919/riratugutemuze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/64825002389.pdf
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/police_academy_8.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/tubutivaxemaluvajenidomaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7962/3071/files/65267756756.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9768/files/dubitetakonum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9052/files/catalogo_avon_17.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/wujumedefipituta.pdf
    • https://cdn.shopify.com/s/files/1/0428/2669/4822/files/99756497893.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/traduction_fichier_anglais_vers_francais.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6119/files/cooling_tower_design_basics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/16935952428.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_off000063ed.bin
9aed50aad6d00eced0b3223b060af54d6c357af323da40f543da57240a22aae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x63ED 5260 bytes
font_01_sfnt_off000075b3.bin
218ecad26096adae76c1b1c33e33f79348fb558eebd8a58ebc8f441eaa35f514
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B3 10548 bytes