Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bfefd705aacf90…

MALICIOUS

PDF

49.6 KB Created: 2020-09-09 14:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d613aeee4904210baf4b462d51225a51 SHA-1: 90a6c7fb03ee391466dcfd1b261dc8a864fb1741 SHA-256: 97bfefd705aacf90addf023e86b1ce4f3983d66020b841df1764c9ba4f62a296
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.club/wix?keyword=doraemon+new+movie++in+telugu, is identified as a known malicious redirector. The document body appears to be corrupted or contains obfuscated text, but the presence of the malicious redirector link is a strong indicator of malicious intent, likely to lure users to a phishing or malware distribution site.

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=doraemon+new+movie++in+telugu
    • http://files.isabelenglishcomp.com/uploads/1/3/1/4/131453109/853365.pdf
    • http://files.message6666.com/uploads/1/3/1/4/131406140/tijiwus-voxoporava-fedowum-disojum.pdf
    • http://files.sunflowerblingbox1.com/uploads/1/3/1/8/131856392/tupegura.pdf
    • http://files.postpartumslimdown.com/uploads/1/3/0/7/130739614/8031cd0b9568a.pdf
    • http://files.seanmoyses.net/uploads/1/3/1/8/131857920/e3659fc7dc5e.pdf
    • https://static.usrfiles.com/ugd/7be1cd_81a1138eae9845e08ca9d26cbf907c62.pdf
    • https://static.usrfiles.com/ugd/87d215_022e7f9e23314fc8ae74cb520d189a44.pdf
    • https://static.usrfiles.com/ugd/a8c229_027cc862bfb74500a285417c2f65a81e.pdf
    • https://static.usrfiles.com/ugd/64d889_106776666bfd42e2bef0090f39118c88.pdf
    • https://static.usrfiles.com/ugd/941881_e4f494c36a7c4ef881b4eb41da8383eb.pdf
    • https://static.usrfiles.com/ugd/eed56f_2ba4ca80186040f9bdce5f58fcad1c15.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/kifubedowevuzususevowerag.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/simepoguragafalosapik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/bamujasi.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_off00006830.bin
b04c51a3bea489621108e971ceffbbeae2a58146d962b639e6a2efe254ce861f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6830 5504 bytes
font_01_sfnt_off00007b2d.bin
9f524e82c2c4b870ddc84c1621872ae99459306bd438449eee04d47b259c4a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2D 4976 bytes
font_02_sfnt_off00008c1f.bin
448a2de02c6963967a05745f191791058725ba2ace4878fd26d198e18cde1567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1F 14584 bytes

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