Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d474cb181eb583f…

MALICIOUS

PDF

50.1 KB Created: 2020-08-23 00:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 246d22763c75750587f9175a2df8b036 SHA-1: d6eee6ce2de43425c70515412f5e0a688defb61e SHA-256: 5d474cb181eb583f34e2912db7809d14559689a6b076355797cd9a78d1272e93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious content. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection.

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=cartesian+form+of+complex+numbers+calculator
    • http://files.laurapowerdaviesartist.com/uploads/1/3/1/4/131454034/votafoj_wogetami.pdf
    • http://files.gaythessaloniki.com/uploads/1/3/1/4/131453206/zoronofami-letonikenajuv.pdf
    • http://kofozesa.psychedelicsmadnessawakening.com/uploads/1/3/1/1/131164250/8402300.pdf
    • http://gunona.northalbanylodge.com/uploads/1/3/2/7/132740978/merabeviderade.pdf
    • http://files.annualreport-m2016.com/uploads/1/3/2/8/132814427/delopufekigo-rotivobo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4429/8133/files/4293423414.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/gafubojasifoxedabizumiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/3350/8512/files/xovalemubuwagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/ganataware.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/gozerivefemipopibukuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/sukulexekufif.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/jonomobaza.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/puwanox.pdf
    • https://cdn.shopify.com/s/files/1/0434/3395/1399/files/zejefuwuranozig.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_off000060bd.bin
68a996d8b5f5c95a2989cbacd5f6dcc8fb17e53e32ffa04c88e0c2ed7c519059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BD 5272 bytes
font_01_sfnt_off00007296.bin
f6110f06c96c525f02bfaf542b746b0cb731be8977af3b88c5e8d062eb1519ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7296 15396 bytes
font_02_sfnt_off0000a410.bin
2da7240b515aefb86c699d6b9c9e80df1096f28e2ca701347fd3a560c4af6249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA410 16120 bytes

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