Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2d97cfff18d9c1…

MALICIOUS

PDF

36.8 KB Created: 2020-09-04 00:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 081ac5c1c5f4478b0c8f4afa3addc523 SHA-1: 584d0114ffbeb245c2e391587c2b4c47bc8751e9 SHA-256: 3f2d97cfff18d9c1c1ba5caee7e8862c3a93ddcf15462c9140128c09ab53aadf
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'bandakala script font free' and a URL that appears to be part of a link farm designed to distribute other PDFs. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of 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.link/pify?keyword=bandakala+script+font+free
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/97389177600.pdf
    • https://cdn.shopify.com/s/files/1/0432/0002/0635/files/xosomumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/zupezupogujudaxutedopape.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9839/files/66712108843.pdf
    • https://static.usrfiles.com/ugd/5a1791_2d36af23d08f4fa58dff7d9d29b96310.pdf
    • https://static.usrfiles.com/ugd/b8c837_33284a30091f4077a062a2edbcfe5c9e.pdf
    • https://static.usrfiles.com/ugd/c8df25_9638f3c5160742c2b9cba64746cd891a.pdf
    • https://static.usrfiles.com/ugd/191a6d_07c2eb820bfa428c8f1a79404969203b.pdf
    • https://cdn.shopify.com/s/files/1/0440/1453/4806/files/49373221219.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/16937312051.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/642878205.pdf
    • https://cdn.shopify.com/s/files/1/0430/3283/8298/files/denso_alternator_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/munedep.pdf
    • https://static.usrfiles.com/ugd/f64db8_30559de240de47449844518a13b92c22.pdf
    • https://static.usrfiles.com/ugd/e643da_ffaa829ead5c457f82344a3c49020f7a.pdf
    • https://static.usrfiles.com/ugd/0c41e7_df1404291777458a9e4d78a8e867887b.pdf
    • https://static.usrfiles.com/ugd/8cbfce_f60b7f5ded8943549aef830c3a07e8bc.pdf
    • https://static.usrfiles.com/ugd/027f51_48998b2fd5a94c05b19e8d477cbcff7a.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_off00004712.bin
89bfd2af125a9c6d3ba187d8f3ca7eb438bcc386eb62fd0be9f23ce616fe5c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4712 5048 bytes
font_01_sfnt_off0000583f.bin
f10db012adfba1fae599c17e946dc5ae9f01b15354ee18344c3bf2a05af0ef3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x583F 8800 bytes
font_02_sfnt_off0000764d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764D 4324 bytes

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