Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2476e3a33b3f19…

MALICIOUS

PDF

46.3 KB Created: 2020-08-09 01:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 219375562b7a1350041caa5fff18aa97 SHA-1: edd325ac05e35c058eaf2b8f2af0781402fac7f5 SHA-256: 5f2476e3a33b3f1920259d9e3e6dafa17d97f705e7c63b3385cd8571b8dea89b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/pify?keyword=terjemahan+kitab+barzanji+pdf'. Additionally, it exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains the malicious URL.

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.ru/pify?keyword=terjemahan+kitab+barzanji+pdf
    • http://biguput.equestequinefirstaid.com/uploads/1/3/0/8/130874478/4526067.pdf
    • http://files.countertruth.com/uploads/1/3/2/7/132740458/xefudokavisam-fofanovalobin-borinidiposix-jojovigez.pdf
    • http://files.lifeoflongearion.com/uploads/1/3/2/7/132711954/vudopifibetebim-xogadila.pdf
    • http://files.abigailcrscott.com/uploads/1/3/1/8/131857270/7128790.pdf
    • http://files.articulatetree.com/uploads/1/3/1/4/131453560/3299548.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0972/6888/files/wukigidonekiwatofug.pdf
    • https://cdn.shopify.com/s/files/1/0433/9279/4774/files/68818845941.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/79132623268.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/arquitectura_barroca_en_inglaterra.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/1386664240.pdf
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/tuwiba.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/dozamevutegokunosusezizu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/icy_basalt_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/wixaloro.pdf
    • https://cdn.shopify.com/s/files/1/0437/3810/3962/files/93013987522.pdf
    • https://cdn.shopify.com/s/files/1/0431/2609/6036/files/26908945574.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000082af.bin
cd2ac1115980db594362ca086a208f05ba9bb90e311da14faeceec06de244184		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x82AF 22516 bytes
font_00_sfnt_off00005260.bin
15f43a88ab83f802d11eed3d9fbf873659e2ddb7012290280a77ab64cd6b39fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5260 5348 bytes
font_01_sfnt_off0000646a.bin
a0b95cdbb5673936dacd613d48742aa0be1d1fa4d0f1a33578a389eac59c86c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646A 8944 bytes

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