Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ac551f795e0d22…

MALICIOUS

PDF

38.9 KB Created: 2020-08-23 02:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4f77372229c216abb29fd8132e932de SHA-1: d015010211415fe8730034fce8a116de97d87154 SHA-256: 99ac551f795e0d2297e0d4c61bcf2a5440dc110ddb7839e198c95f2489501aba
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, many of which point to what appears to be a link farm designed to improve search engine rankings. One of these links, however, redirects to a known malicious domain (ttraff.ru). The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to trick users into visiting this malicious site. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=punctuation+marks+paragraph+exercises+with+answers+pdf
    • http://notetib.ysgolcybi.com/uploads/1/3/1/4/131407267/cb200bf2804.pdf
    • http://fetak.mamechevarria.com/uploads/1/3/1/3/131383657/78628b.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/pokerogejas.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/sixaburi.pdf
    • https://cdn.shopify.com/s/files/1/0447/8546/7558/files/aadhaar_card_file_password_remover.pdf
    • https://cdn.shopify.com/s/files/1/0428/8577/5519/files/rivud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/15092451989.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/wuxumebemaremipuwazoli.pdf
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/pibolofexamete.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9402/files/paleo_diet_food_list_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/39874895850.pdf
    • https://cdn.shopify.com/s/files/1/0434/4201/2327/files/5_meo_dmt_trip_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/livro_daniel_hernandes_dias_lopes.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_off000057f5.bin
d987a00bee77bf41506665ff0f573dfb715ebca8f265b088c989af1e75c09cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F5 5760 bytes
font_01_sfnt_off00006b7c.bin
5cb8dc1e26804fa1e273b6a6e67340de6fefb95583a81aff41dd570f100947b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7C 10372 bytes

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