Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fd7dbf10c067e7…

MALICIOUS

PDF

39.5 KB Created: 2020-08-23 10:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d2fd2513e31609f0b9edfe5db0ef23 SHA-1: 0cd03c48f5223e38a757757e32e26cd72a52617f SHA-256: 25fd7dbf10c067e7e78b9d42acda1ac3a441dfeb4e77b6dbba1590b2987effa8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Canadian immigration forms for visitors' and the malicious URL itself. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=canadian+immigration+forms+for+visitors
    • http://files.jjjohnsonauthor.com/uploads/1/3/1/4/131437268/lotoxaboxubuw.pdf
    • http://majafi.mentalhealthhelpforyou.org/uploads/1/3/0/9/130969723/nivoxen.pdf
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/sososakositelubiruguni.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/factory_service_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5591/4918/files/affairscloud_weekly_june_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9039/4788/files/mapa_metro_y_rodalies_barcelona.pdf
    • https://cdn.shopify.com/s/files/1/0439/8707/5230/files/angina_inestable_electrocardiograma.pdf
    • https://cdn.shopify.com/s/files/1/0430/6635/9962/files/loletevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/pensonic_bread_maker_recipe_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/2096/8351/files/affinity_photo_tutorial_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.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_off00005cb7.bin
2340efe5a06b743d6b6d77dc22d2c150c2b4d4186260808c947f697acfdc18a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB7 5160 bytes
font_01_sfnt_off00006e33.bin
208886a745efc7db746ef45478fbb1b35444c328ce7f99b4cdd843e979553767
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E33 10304 bytes