Malicious PDF — malware analysis report

Static analysis result for SHA-256 921cfd3f50a2777e…

MALICIOUS

PDF

46.6 KB Created: 2020-08-02 19:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 840b0bcf1d632b44d2cce82188776ef8 SHA-1: cdadd5f6348993b6737f1f6207b39c23497d2417 SHA-256: 921cfd3f50a2777e6f356f23b8ce3de65002200cf8d1c1c8d8613a17cf01a5ba
234 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is further associated with a command lure instructing the user to 'add program to startup windows 10'. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a social engineering attempt to trick the user into executing commands. The presence of a link farm heuristic also indicates a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=add+program+to+startup+windows+10 In PDF document text
    • http://files.centremarembo.org/uploads/1/3/0/8/130814669/delapobalodepu.pdfIn PDF document text
    • http://fomizax.yyceliterenovation.com/uploads/1/3/0/9/130969358/gerafapexosas.pdfIn PDF document text
    • http://files.keyscientific.net/uploads/1/3/0/9/130969577/3814619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/togomuxaverebotimosegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/xujoruxutumufe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/sekiro_bite_down.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5608/7708/files/kovagufunuwunuwegunun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/86606664177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4115/9333/files/ford_5000_tractor_manual_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/94949740753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/game_of_thrones_audio_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6241/7825/files/sekelozar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/36545171919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/60366024983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/jopimapisom.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 5288 bytes
SHA-256: 64352fd0865b8fb7b26a8cf6228bbc5de5fc48a5a3e7a17d19cb8ffa855fd932
font_01_sfnt_off00007bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 10256 bytes
SHA-256: 78ae14094e2bebc50eaeabbc088276b47d6aa088713d4efd13eefe472f94d1f9
font_02_sfnt_off00009ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c