Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe3426757e3b7e0…

MALICIOUS

PDF

61.1 KB Created: 2020-08-21 15:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da047d55a3d0d99c8fbade50278ce8a SHA-1: ede466a6d7f261987aa28c807e05d4ae80649658 SHA-256: 1fe3426757e3b7e0cc20ceaf09ddd45a58a7f9f1e7ad41311e1fdf200f9c3db2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=different+forms+of+carnosine'. Additionally, it exhibits a PDF link farm behavior, with numerous links to PDFs hosted on shopify.com. The ML classifier also strongly flagged this PDF as malicious. The presence of these indicators suggests the document is designed to lure users to malicious infrastructure.

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.cc/pify?keyword=different+forms+of+carnosine
    • http://files.recoverydharmaphoenix.org/uploads/1/3/1/0/131070212/1700915.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/68487802850.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/39366098387.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/mewatit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/assumptions_of_rational_choice_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/madadagilagutalus.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/irrigation_engineering_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/building_construction_book_by_rangwala_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/how_to_stop_gmail_sync_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/osrs_watchtower_quest.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_off0000b234.bin
23f4bdf8046df56b8c9e0186aca541df323a0cd5115cbdeaedfc29d356b691ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 4996 bytes
font_01_sfnt_off0000c31d.bin
8eca275c90df133b0112ef06dc53ef3494f2026a60287ed5d0bc152222809517		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 10752 bytes

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