Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4af4ca52abbf55e…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 12:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6016dbfd904ef4b2fc16bc40ba9b98b SHA-1: 7490d162afb87d9722723d73499af2046b00f9a6 SHA-256: f4af4ca52abbf55ef108b9c371b791330e2c65eceee3aa292373901496afc539
152 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=ways+of+the+world+textbook+chapter+8+pdf, which is a known malicious redirector. The document body itself appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to manipulate search engine results or distribute 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.cc/pify?keyword=ways+of+the+world+textbook+chapter+8+pdf
    • http://files.collinsfamilyhomestead.com/uploads/1/3/0/7/130738801/zeragokutax.pdf
    • http://files.juliesenf.com/uploads/1/3/1/0/131071151/8f27ae12d8b.pdf
    • http://files.simplified-networking.com/uploads/1/3/1/3/131378990/tuzelajuvubiz.pdf
    • http://files.lsuhealthsciences.com/uploads/1/3/1/3/131378852/fifefoduvululek.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/tagalog_catholic_mass_songs_with_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/nujawolemesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/8228178179.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/dilikisetis.pdf
    • https://cdn.shopify.com/s/files/1/0428/4320/9895/files/88427375613.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/tudofovifafuxusopuwosadop.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/56521754831.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/pakexozipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/veterinary_cytology.pdf
    • https://cdn.shopify.com/s/files/1/0434/4542/0188/files/84556894189.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/65915386459.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/xetomot.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_off00007678.bin
8e9b673b5d917d467e4221cfbf90bcd2af57db4039c93f2ec3af601b01fe22ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7678 5916 bytes
font_01_sfnt_off00008ab2.bin
802ddd7c42206e4dfd892a32e1eaf23133d2e302a03ac382290a4ffeb6e81ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB2 9824 bytes

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