Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bf34d965c95948…

MALICIOUS

PDF

39.6 KB Created: 2020-09-13 19:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb9a89b7f412544e5d3cf465a7d6750 SHA-1: fd80bdb1f2260b6e22fa6f6eaf91336dca531163 SHA-256: c3bf34d965c959481010ad15e56a2a6187585a7afdf49504779c3006f7dd1ceb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on shopify.com and static.usrfiles.com. One critical heuristic identified a link to a known malicious redirector, ttraff.link, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains the string 'https://ttraff.link/pify?keyword=ge+built+in+oven+manual', indicating a lure related to a 'ge built in oven manual'. The presence of numerous links and the redirection to known malicious infrastructure strongly suggest a phishing or malicious redirection attempt.

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.link/pify?keyword=ge+built+in+oven+manual
    • http://files.maryannminersartist.com/uploads/1/3/0/7/130775498/zefipitewudo.pdf
    • http://mizopagez.beardedbomb.com/uploads/1/3/1/0/131070894/tikavoliz.pdf
    • http://vujufef.rayyaneh.com/uploads/1/3/2/7/132710621/xagit.pdf
    • http://bexuv.ourcollaborativeteam.com/uploads/1/3/1/4/131406827/f7401cfb172ef.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/sumibemogelefobugovalux.pdf
    • https://cdn.shopify.com/s/files/1/0428/5018/9478/files/sajosowosedumewo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/49286932690.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/66298064691.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/neteferixonaposuxebokon.pdf
    • https://static.usrfiles.com/ugd/49488e_6b8c71a4df854c0b900e15e59b9ce25b.pdf
    • https://static.usrfiles.com/ugd/1a89c8_77c93ea862834c4ebe97b35b62e04999.pdf
    • https://static.usrfiles.com/ugd/b09e1d_5b92b5f0941d479a9e6b59b15356845e.pdf
    • https://static.usrfiles.com/ugd/9ec29b_da3c7cf438344366a586ec20ad89ad75.pdf
    • https://static.usrfiles.com/ugd/affb4a_0a2f96e0223a4fc785c78efeba095700.pdf
    • https://static.usrfiles.com/ugd/83b1b3_ec38efbfed764e3c9e47c054cddb695d.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_838f40090ab14c8dbcf83159e4788e3c.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_off00005d72.bin
ff1b1c88a3019a560f01b79326c3344b1ec614093ed9b655ff250bb26fd8780e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D72 4788 bytes
font_01_sfnt_off00006db1.bin
662a42934b00bae27ed49de310ec44e5bb5d81176cf20974c15bfc35fcaedc78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB1 10524 bytes

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