Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a46640cb879c0b4…

MALICIOUS

PDF

43.0 KB Created: 2020-08-17 09:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 137d76c59a572115d756c9465e1d35b3 SHA-1: 82d20630a37cecad1c0498310f3d0e72d72637b3 SHA-256: 8a46640cb879c0b4ae624d4f48bfaab07e0c28619b07aaf98c55012f712bbf22
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to 'ttraff.ru' which is flagged as a malicious redirector, likely serving as a lure for downloading software. The document body, though heavily obfuscated, contains the same lure text and URLs, reinforcing the malicious intent. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or distributing further malicious content.

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=autocad+2013+software+free++for+pc
    • http://gebupos.shupik.com/uploads/1/3/0/8/130814328/1738796.pdf
    • http://files.happytimedaycare.org/uploads/1/3/0/8/130814421/a7408e4c7b9f.pdf
    • http://files.mixmax.biz/uploads/1/3/0/7/130740013/f867b3ec9e.pdf
    • http://kekimo.connectabletherapies.com/uploads/1/3/0/7/130776054/tikajo_wivadirofarase.pdf
    • http://xedibaw.jemmakehoenutrition.com/uploads/1/3/1/6/131607505/resewugaxekij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0436/2600/4642/files/49089607799.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/69448151484.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/musaborelivimumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/memupatejejevuzefi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7743/files/beveiligd_mailen.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7912/files/ayushman_bharat_card_bimari_list.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/bee_products.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/54299604977.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006833.bin
3c7afc8765c3a5a294f0ff6ee0b0e34d88b7b2d9bfca28494f7d9414012fa96e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6833 5688 bytes
font_01_sfnt_off00007bb0.bin
0841ef76df399fb62c9b5217595c5344bb20fe8dde703d252ab731a29bb59752
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB0 10420 bytes