Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf9d36808901495…

MALICIOUS

PDF

45.5 KB Created: 2020-08-10 08:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6089a9dbabd2136ec637f7543c895fd9 SHA-1: ee58f88f7bd96892f99f0b18c725726e6126f035 SHA-256: 9bf9d36808901495c920b39425adf2d75a14d0a9fa17df734859a275cbb27074
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'byomkesh bakshi pdf download free' and a URL that aligns with the malicious redirector heuristic. This suggests a social engineering lure to trick users into downloading potentially malicious content. The presence of numerous Shopify links, while many are confirmed benign, is part of a link farm strategy to improve search engine ranking for the malicious redirector.

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=byomkesh+bakshi+pdf+download+free
    • http://files.rice-military.org/uploads/1/3/2/7/132712080/kolasaralejilividoto.pdf
    • http://sipesulim.animalhealthcentre.ca/uploads/1/3/1/6/131637136/bezofifurokezidito.pdf
    • http://files.kristynlanggundlach.com/uploads/1/3/1/0/131070702/laloloxepifo.pdf
    • http://files.brhoriuchi.com/uploads/1/3/0/7/130776402/29744.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/pulurepaker.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/31929414167.pdf
    • https://cdn.shopify.com/s/files/1/0435/2720/9120/files/45929030296.pdf
    • https://cdn.shopify.com/s/files/1/0428/9773/5836/files/is_5_a_composite_number.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0359/files/descargar_catalogo_de_truper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/vasiruwewefabenejitizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/46441962261.pdf
    • https://cdn.shopify.com/s/files/1/0434/9624/3364/files/bupuwetirabopun.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2749/files/kiran_bank_math_book.pdf
    • https://cdn.shopify.com/s/files/1/0446/6160/4505/files/regisrty_first_aid.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/kirotemagebogodukur.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_off000064f5.bin
5b02a3475671bc4940eaa58f696f4f1e3029c806c213653a6ecca50d961e697d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F5 5436 bytes
font_01_sfnt_off00007756.bin
7f5284e8616a8144ef7ab9851df2a8e18655f376ac1abef7895462fbddc1eefa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7756 10464 bytes
font_02_sfnt_off00009b20.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B20 4324 bytes