Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3105bcdf2345cae…

MALICIOUS

PDF

38.6 KB Created: 2020-09-01 02:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b34b97cc30ba6d7f5a675a41e8341838 SHA-1: e612d0afa332572cfc04098e01fbd4f49b86bc1e SHA-256: a3105bcdf2345caedb8b45be611b017a5b4b6ca63e86cd3ea46860ef9ce6b26d
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=adobe+indesign+cs5+user+manual+pdf'. This link is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of a mass external PDF link farm further indicates malicious intent, likely for SEO poisoning or distributing further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=adobe+indesign+cs5+user+manual+pdf
    • https://static.usrfiles.com/ugd/8ba634_95ae87bf6e8b416fb1af22a11cccd478.pdf
    • https://static.usrfiles.com/ugd/cc089a_93e179cffded422c8ca463f911cc41d6.pdf
    • https://static.usrfiles.com/ugd/b6edda_538796f287d94f6693b5e61d267d7df5.pdf
    • https://static.usrfiles.com/ugd/b8c837_64e22d33b8e24ab081d2ae50c4621a43.pdf
    • https://cdn.shopify.com/s/files/1/0464/6046/9400/files/carry_on_jatta_movie_free_hd.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/91762942006.pdf
    • https://static.usrfiles.com/ugd/7f46b5_55f9249267274a9cb97e439bee39cbc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5751e6bda844f2b8fa809d0d9be069e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5d37feffc15469badd09f3a45dd958d.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/diralotupotozedidetofoni.pdf
    • https://cdn.shopify.com/s/files/1/0463/2120/5405/files/bootstrap_4_sass_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/xutubipidewetoxokuwumis.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/daily_attendance_sheet.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_off00004977.bin
43d23eb60b5a474064443377013f530506a194e67f94cdcbd4ebd1558b2dd7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4977 5532 bytes
font_01_sfnt_off00005c1e.bin
c095903669779e3844525672bbd394b4283f8bf16f0da8726022ff0ebadec7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1E 10536 bytes
font_02_sfnt_off00007f9f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9F 4324 bytes

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