Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a3cfcac860a27e…

MALICIOUS

PDF

50.0 KB Created: 2020-08-17 05:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98d1df4ce6be717399c32b4c8482e634 SHA-1: 6e02a51aec3b28e459a7f83182e6b86917f59db6 SHA-256: c8a3cfcac860a27ea941f4cc3c1615ca247ac732ed7c319c09f37f4e1e788f7c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains the same URL and keywords related to 'piano sheet free', suggesting a lure. The presence of a visible LOLBin command execution instruction indicates the potential for further malicious activity, likely initiated by the redirector.

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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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=one+summer%2527+s+day+piano+sheet+free
    • http://files.isabelhowlett.shop/uploads/1/3/1/3/131380440/nobogixubi_befivuw.pdf
    • http://pukelevi.juliannawells.com/uploads/1/3/0/7/130775607/nudalegubofolasim.pdf
    • http://masojis.hawkinsortho.net/uploads/1/3/2/8/132814074/45186e018aac.pdf
    • https://cdn.shopify.com/s/files/1/0438/2621/7120/files/non_conformance_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/powershell_split_string.pdf
    • https://cdn.shopify.com/s/files/1/0437/6503/9261/files/kamawerazenukagijuwaxena.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/sobovarewopafaliregokik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/sidofixajaxujufekurugawod.pdf
    • https://cdn.shopify.com/s/files/1/0438/3883/2800/files/node_read_json_file.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/xavupamagerobaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/93911604495.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/talugatalukalafuseso.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4491/files/functions_math_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/javascript_timer_countdown.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_off00005a15.bin
ddeccfc0d5d4da11ddc449729561dbb2507b898cf75bbe3d0a3800dddb2cf0a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A15 8320 bytes
font_01_sfnt_off00007647.bin
9f95a932c7c070ecf2f0d9c80a26bb427d9e9a9cc38776a5cd288a50141c8ce0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 5412 bytes
font_02_sfnt_off00008893.bin
af74b8266b30d262a26095bc9c0d0e2ac4924306fb9a314be59140ae0ea0ed53
pdf-font-stream PDF embedded font (sfnt) at offset 0x8893 15144 bytes