Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f6b05c7c7d010f…

MALICIOUS

PDF

46.9 KB Created: 2020-08-29 08:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27f97a65672eb1d5019aa8395c524081 SHA-1: c6e97680ec21b08e785fcd7ab0ea9b155b366f35 SHA-256: 53f6b05c7c7d010f30e3385e1fdd07d8452799c0c1f63046e0bc471bfad802ed
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Abirami anthathi tamil lyrics pdf'. This suggests a phishing or social engineering attack aimed at driving traffic to malicious infrastructure.

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=abirami+anthathi+tamil+lyrics+pdf
    • https://static.usrfiles
    • https://static.usrfiles.com/ugd/b8c837_67c64a9c2f754421b6514bb9639c7202.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1f7a7240fc547119f6dc051bed9310f.pdf
    • https://static.usrfiles.com/ugd/b8c837_779a8f071e7742d2b48e30c0235c4d51.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae0e9126a33546a8a2ba2eddea92654a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d875d13cd1e6451d9ac5728e0dbfcc71.pdf
    • https://static.usrfiles.com/ugd/b8c837_f56671191947460eb84ea13a712d7700.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a71ef40ea9d49809e09974973cf19bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a706235fe794776a178604631b4eccc.pdf
    • https://static.usrfiles.com/ugd/b8c837_6611383f101e4964bd06c5f8bab29af1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f55594e5fbb4190bff4b28a406ba1ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b1e7c6323bf4b9a92f753438ff76aec.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_off00007a6a.bin
cad388fa5d778727778c20d65ce6f2dc4c2c3323b389a883dac2e20ea60a64c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 5628 bytes
font_01_sfnt_off00008d51.bin
ecc1d9fe82717387755881050b9279ebdd0736d5104350b43ff0cbe5695f5191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D51 9768 bytes

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