Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd20eb419a1c9a9…

MALICIOUS

PDF

65.8 KB Created: 2020-07-30 06:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e08b91100d956c2897dba565e843bc SHA-1: cd04f5d185b4aef61bf1176383f084d300fd8489 SHA-256: 5bd20eb419a1c9a969eeac02a6ac99687818fc70aa24c93e7fdaad4e37603939
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to number conversion, likely to trick users into clicking the malicious links. The presence of a large number of external PDF links, many with numeric slugs, indicates a potential SEO poisoning or link farm tactic to distribute 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=arabic+numbers+to+english+pdf
    • http://files.rustywoods.com/uploads/1/3/1/8/131856619/90032342d853b.pdf
    • http://files.backdoormission.ca/uploads/1/3/1/6/131637273/f40cf99.pdf
    • http://files.elysianbotanica.org/uploads/1/3/1/4/131437454/6785233.pdf
    • http://files.newbraunfelsfencingpros.com/uploads/1/3/2/6/132681728/9b40de7545157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/82783117990.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/lurikodikovokika.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/41705218074.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/93177036071.pdf
    • https://cdn.shopify.com/s/files/1/0432/6945/6028/files/58073003801.pdf
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/40213785781.pdf
    • https://cdn.shopify.com/s/files/1/0429/1556/1638/files/gipisuvabakisitiguxekuxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/25242109994.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/88318918737.pdf
    • https://cdn.shopify.com/s/files/1/0430/5390/8117/files/75221418899.pdf
    • https://cdn.shopify.com/s/files/1/0434/4217/6150/files/94786746017.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/ziwikofuzagunuteruwil.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c58.bin
17c3edd9dd57921cbfb4ac6a021bb6a641df8eaf6bc14511cf998793ed841c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C58 5580 bytes
font_01_sfnt_off0000af13.bin
69ff4f56d2ca8bee878985be754358f53e49051f29acbe2b592f769ea45dd539		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF13 10576 bytes
font_02_sfnt_off0000d254.bin
f602f60736e1da1ee1a812e7b1fa85010c6916fa7e767d209b05bee0f0f4c364		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 22252 bytes

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