Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca30e36e7153c20…

MALICIOUS

PDF

51.1 KB Created: 2020-08-23 09:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62c7c845e5c56c8a132ec553e042d861 SHA-1: 2232a71fba1d13d12ec34f19c90321a30b1ff966 SHA-256: 5ca30e36e7153c2030df1a9adac054fe2dd269d954c0144c0c71ef03aa92826d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=chrome+os+android+apps+list, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for users interested in Chrome OS Android apps.

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=chrome+os+android+apps+list
    • http://files.landofmadmen.com/uploads/1/3/1/3/131397927/nexixofumekata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0704/8860/files/86200937282.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/31905696273.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/93173685269.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7958/files/png_borders_and_frames_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/54017227890.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6551/files/92551957881.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/adobe_photoshop_cs5_1_brushes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8507/8423/files/beowulf_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/98554379275.pdf
    • https://cdn.shopify.com/s/files/1/0438/1576/4128/files/13752412871.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/renuxenowefuvog.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_off00008ca1.bin
6f7de7bbdfb98d93c5d2b94fbff2eb32716930d93f901f052802e1a993bae831
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA1 5104 bytes
font_01_sfnt_off00009dcb.bin
8a2b32be770d116122ab2c19066537e527718ad06d1cc01013a394ca155913c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCB 9944 bytes