Malicious PDF — malware analysis report

Static analysis result for SHA-256 185b41da34ba58f7…

MALICIOUS

PDF

34.5 KB Created: 2020-08-30 15:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce2cae59103dd77484c10f89c938127c SHA-1: 30bc152efc40f08ca5b1d4ff03b42877667f3da4 SHA-256: 185b41da34ba58f75f30e8524a992b3463c7a5b1205ba1e273b40ec6c16be04d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that point to a redirector service, which is a common tactic for SEO poisoning and phishing. The document body, though heavily obfuscated, contains text that appears to be a lure for a religious PDF, likely to attract search engine traffic. The ML classifier strongly indicates maliciousness, and the presence of multiple external PDF links further supports a 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.club/wix?keyword=lakshmi+ashtothram+telugu+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0cd3a8_7d21129f48754902b07cb2f4a1394196.pdf
    • https://static.usrfiles.com/ugd/08fe48_eb101db1e8a64ed39fe4df3cd5bef30f.pdf
    • https://static.usrfiles.com/ugd/158fb9_2fd12267161145dbac23a1e8da83ff76.pdf
    • https://static.usrfiles.com/ugd/9e41f0_6c5c9945fd0f4063ac4641767d31557f.pdf
    • https://static.usrfiles.com/ugd/b8c837_66c63703024c45c3942bc6ac7713b1aa.pdf
    • https://static.usrfiles.com/ugd/b50c55_1c0684c85d0b4adcbe3fb4595cabebd2.pdf
    • https://static.usrfiles.com/ugd/4dd980_4fdb45292f92474fa49d9be8f3c1d066.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c723ba9a3f5462caa9481fd5195fafa.pdf
    • https://static.usrfiles.com/ugd/921909_b0320e5c53ba4e8da752151897c15d28.pdf
    • https://static.usrfiles.com/ugd/63d3ad_02ff14a7b97b49c7b51de367549d2311.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000446f.bin
4e8d7459578814bbb23200a11d51873b48cababa5b83fba37a01c98161ca6187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x446F 5460 bytes
font_01_sfnt_off000056e2.bin
b42c98a3b9f9270fd7044422562c4007a0d82090e6637f6a4a38baff5cdc8e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56E2 11984 bytes

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