Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b96fd42a049749…

MALICIOUS

PDF

43.5 KB Created: 2020-09-08 13:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e04a42cb4d5a166245e1c034e7a9f604 SHA-1: 8cf4eca0bb92fd4b69054bd3063125e6b4d7f5b3 SHA-256: 04b96fd42a049749a5e1accee70e7926603513f19dd43a5d5f37043f18784326
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.club/wix?keyword=chennai+gana+songs++2017', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this malicious URL, reinforcing the lure. No scripts were extracted, but the presence of numerous links and the identified malicious redirector are strong indicators of 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=chennai+gana+songs++2017
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0439/3133/6859/files/medical_report_online_status.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/bewusokovatuwewimawe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5591/files/addition_of_hexadecimal_numbers.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_9ad4c8a1b0b4405a89d734021c1995c2.pdf
    • https://static.usrfiles.com/ugd/a474dd_1cfefded9034413cb0dd087f894c6d13.pdf
    • https://static.usrfiles.com/ugd/0adedf_b711bd1d64bd48cbb00bc68d3cc30bd8.pdf
    • https://static.usrfiles.com/ugd/12745a_019b2f07a24945d6b9a8bb859b38cb89.pdf
    • https://static.usrfiles.com/ugd/54dfea_bd5c9eeb202e4c679b443c3445f1f2b9.pdf
    • https://static.usrfiles.com/ugd/868401_31fd195c750e4c6a9928fc0973b72d3a.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043f0.bin
25325177a9968ec83c86bcaddd7d2fb04d9a9f02142b01a653f412f9dba951d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43F0 5128 bytes
font_01_sfnt_off00005569.bin
0a1da398208282f7d6e4e42e718209fad92fd148865078237d5555c10fb25558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5569 5808 bytes
font_02_sfnt_off0000684b.bin
beaef1f443512208d6efa5c0d737314f5783b3c4325d0e5a57d3d02329416f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684B 9836 bytes
font_03_sfnt_off00008a5e.bin
d6d1e6da21b80da50464f8047c204254c23b4d7b90f3453159d9a0d4fc2986bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5E 16612 bytes

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