Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f41b32769165408…

MALICIOUS

PDF

46.6 KB Created: 2020-08-07 19:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6098da7467152c8a91c4e348f6bc16f5 SHA-1: 43608885052fc21c8faa47c78f6213120917035f SHA-256: 4f41b3276916540817609f29306d8e37ffa173400f3b33c58af971987fd4b4c3
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a malicious redirector link disguised as a download button, aiming to lure users to a malicious site. It also features a link farm with numerous external PDF links, likely for SEO manipulation or to host further malicious content. The primary malicious URL identified is https://ttraff.ru/wb?keyword=best%20histology%20book%20pdf.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=best%20histology%20book%20pdf
    • http://files.ayatechnologies.net/uploads/1/3/0/7/130775174/momupovu-foduvenakomefaf-retavog-pepizapuzez.pdf
    • http://files.skippysfrenchtoast.com/uploads/1/3/0/7/130775734/rijepidokasewama.pdf
    • http://files.woodlandsfrenchies.com/uploads/1/3/1/3/131383553/buvomagedax_dopiriveluk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6886/files/jupisizudeparururuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/labokivobuwisuluf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1265/2194/files/tipojowe.pdf
    • https://cdn.shopify.com/s/files/1/0451/7291/6373/files/atos_administrativos_estratgia.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3381/files/basic_english_grammar_betty_schrampfer_azar.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/types_of_advertising_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0437/5733/8776/files/cambridge_academic_english_upper_intermediate_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/8482/4222/files/54945696248.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4968/files/petawigaxuxetamuzusame.pdf
    • https://cdn.shopify.com/s/files/1/0430/7396/2145/files/mutualism_and_commensalism.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/vididimikozabis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/38347825295.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/dajajogotumorifaxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/bemegorunesafazib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006750.bin
73b169306c3b62aa40a3b1577c693d03b152f5ed910e639b06ed81f04026408f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6750 5352 bytes
font_01_sfnt_off00007988.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7988 1800 bytes
font_02_sfnt_off00008215.bin
7bfd0203022f46aed7b8246f37c8c493dec295ef8d377e644ce3bc633ecca2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8215 13832 bytes

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