Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96151ad818fd300…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 04:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 111641aabe7543f74cc25abb9e0dad1c SHA-1: 36b8904edb2304087dfc206bcb390ce8b938f175 SHA-256: b96151ad818fd30063c870949ace3fc3e3a886154612324f83e4754f6ff0477a
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a user manual lure, and the file itself is flagged by a machine learning classifier as malicious. The presence of multiple links to external PDFs suggests a link farm or redirection strategy.

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.cc/wix?keyword=samsung+rs25h5111sr+user+manual
    • https://static.usrfiles.com/ugd/b8c837_a2298079133140999817f0eb7840f75a.pdf
    • https://static.usrfiles.com/ugd/9734e7_05fa67ab734e46acbf682762db03a080.pdf
    • https://static.usrfiles.com/ugd/b8c837_9229c7475ac148419475120c0c0259a5.pdf
    • https://static.usrfiles.com/ugd/e4a001_6c8f4bc6a6b343f7a67ee39b7efa9060.pdf
    • https://static.usrfiles.com/ugd/b8c837_5435ea828fda4f0b96de74b5d0078b04.pdf
    • https://static.usrfiles.com/ugd/12f4eb_12741109c3394399a8f663f7a92b3796.pdf
    • https://static.usrfiles.com/ugd/1a89c8_c795401d15da46d48d913b9b1c4280d2.pdf
    • https://static.usrfiles.com/ugd/d17951_0a4bb15399ea4e5798a35b5683eec4c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_752b1aaa1f574dcb93a3fbfb7c4d109f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3f4a0e144e5436d86d7252bc50e2254.pdf
    • https://static.usrfiles.com/ugd/b8c837_f638475c55ef479c915449acb3f40f13.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/gummy_ost_master_sun_lirik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5916/6888/files/jilobufiteridevawuxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/belajar_coding_untuk_pemula.pdf
    • https://cdn.shopify.com/s/files/1/0435/5175/2344/files/viwolakebawobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/tafejil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea0.bin
005d7317ea1b44d7e82aec6a0688b00e2196d073c383d971e5036fa6c8f91084
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA0 5512 bytes
font_01_sfnt_off00007132.bin
aa0a930c193c3b46deed2472f2ec21dcaa944ebbe34415ea700a3a91bf6b1b33
pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 10364 bytes