Malicious PDF — malware analysis report

Static analysis result for SHA-256 c303d3cacd9050da…

MALICIOUS

PDF

55.3 KB Created: 2020-08-20 02:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24df7fa488d14e14fc4094a7b1da7629 SHA-1: 57f15ebd9ed75cc7bd3fa9d5913bff8fc2464382 SHA-256: c303d3cacd9050da772811bbebec5dec35ca562c31d8ae55e72d42e2ed263407
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm. One critical heuristic indicates a malicious redirector link pointing to 'ttraff.ru', which is likely used to funnel users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing 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.ru/pify?keyword=future+tenses+exercises+bachillerato+with+answers+pdf
    • http://files.jhuxster.com/uploads/1/3/1/6/131636834/tetevuzikizido.pdf
    • http://files.sofpreschooldouglasville.com/uploads/1/3/1/6/131606758/1397325.pdf
    • http://pegim.blackkitchen-blog.com/uploads/1/3/2/6/132680813/zogopakito-zalewijowuvarov-dixogufikix.pdf
    • http://faxiz.joshyblog.com/uploads/1/3/2/8/132816042/1007051.pdf
    • http://files.makergirlz.org/uploads/1/3/0/7/130739564/05095d01439.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/35548457054.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/effective_java_3th_edition_github.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/23750834144.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7194/files/happy_birthday_boyfriend_status_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/70764203080.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/pofitolelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2415/files/jejoviwivufulenujejuzim.pdf
    • https://cdn.shopify.com/s/files/1/0437/5301/3409/files/87046897391.pdf
    • https://cdn.shopify.com/s/files/1/0451/7858/5239/files/understanding_as_400_system_operations.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/arizona_attorney_general_office_forms.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/use_of_spss_in_data_analysis_in_research_methodology.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/free_pokecoins_no_survey.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000604c.bin
8eb34dc77226dd9ca5d4f41c3f0ae0609129cbf4ea56db07ac773cf3b31c4136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604C 5500 bytes
font_01_sfnt_off000072fb.bin
b8fcd4360796febac6cbff9e46382f151dd5291f5431699bd2b827f39151e9cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FB 9472 bytes
font_02_sfnt_off00009279.bin
f34678ae891f21921511f86910cc334b23322ae3357b5597fb750a5d19b1311f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9279 11760 bytes
font_03_sfnt_off0000b884.bin
dcb0019c183e5cd500b40202677621c8942b024e9e4170454656f2c14611f914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 16732 bytes

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