Malicious PDF — malware analysis report

Static analysis result for SHA-256 f783e9f7d19eab66…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 02:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdd8e68c2612e3ba94d63401bfc3cfec SHA-1: 6340bd420d10a27021de79e16eadaf4c839b8078 SHA-256: f783e9f7d19eab66c524ac47ad134e72b582d3870387cdef368f2bcd4719184f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to host malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to funnel victims to further malicious sites. The document body, though partially corrupted, contains text related to 'balancing chemical equations' and a URL that matches the redirector, suggesting a lure to trick users into clicking malicious links under the guise of educational material.

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=balancing+chemical+equations+and+types+of+reactions+pdf
    • http://files.flindersparkchiropractor.com/uploads/1/3/0/8/130813829/faxazafiwixo-kewotifowero.pdf
    • http://files.derrygirlabroad.com/uploads/1/3/2/8/132815806/nipirusemav-buvitovanokeb-wewuziwujiju.pdf
    • http://files.movebeyondit.com/uploads/1/3/1/3/131380767/pirodulazenogobodo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8218/5893/files/old_ncert_ancient_history_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/3603/0629/files/15092896568.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9402/files/czasy_teraniejsze_angielski_zadania.pdf
    • https://cdn.shopify.com/s/files/1/0453/3098/9211/files/oxford_english_to_urdu_dictionary_in_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/notary_letter_templates.pdf
    • https://cdn.shopify.com/s/files/1/0432/8243/2160/files/calculus_early_transcendentals_briggs.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/pedezipalirigerupu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/lojixed.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/83779146314.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/fusupezizejazamimumezov.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/bridgman_dimensional_analysis.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_off000062fa.bin
e4008617a482bee8106d153870ed3ec9984cf2dfb9c2e7d3f274fe89a96e58ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FA 5844 bytes
font_01_sfnt_off000076b8.bin
2a94380dc4e91a878613c29ccc54dd581599ab7b0177b6b40302ddc2172616ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B8 10268 bytes

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