Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbbef3bb3c0a4c5…

MALICIOUS

PDF

43.1 KB Created: 2020-08-17 08:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4b9f145a49e1cb3746ca4f0e3a507d1 SHA-1: 496960e812a1331566731e93545a73306c3fd512 SHA-256: 6dbbef3bb3c0a4c54a825c1843109dacfee344696fe0b9a588dd355c996e7244
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.com/pify?keyword=family+worksheets+grade+1, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to 'family worksheets grade 1' and includes the malicious URL, suggesting a lure to disguise malicious activity. The presence of numerous links, including benign ones from Shopify, indicates a link farm strategy to obscure the malicious intent.

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=family+worksheets+grade+1
    • http://lafegi.villagegreenla.net/uploads/1/3/0/7/130776279/8053493.pdf
    • http://files.credorecoveryministry.org/uploads/1/3/1/1/131164204/vitefadimivu.pdf
    • http://viwafazow.oilymantra.com/uploads/1/3/1/4/131452977/8a5cdfb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/blockchain_app_free_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/java_basics_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/33876217201.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/2007_honda_odyssey_owner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/69920221074.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/bofojapurutaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/xikafizesareseso.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3786/files/73050411297.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/11759369851.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/70600989010.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d15.bin
4fd9782aace8f18845993a3f592b7e28ce7c5f53712137b7c8791453a44b5901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D15 5184 bytes
font_01_sfnt_off00006ed8.bin
eee37a7ca72b0da9c15a39205bb50458b6f50d8d3231b2b59aebaba427843b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED8 10176 bytes
font_02_sfnt_off000091b5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B5 4324 bytes

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