Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f23b4308150b9fe…

MALICIOUS

PDF

42.7 KB Created: 2020-08-29 15:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a2120731831a87b91576362444d8683 SHA-1: 9d9bc1d482877355d90d53377f7a034838d43ea4 SHA-256: 5f23b4308150b9fec44725dad31ad8794a77e2e3e2d4aaac75391d88d7242bd8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=blackjack+chart+printable, suggesting a lure to external content. The presence of a large number of external PDF links, many pointing to benign content, indicates a potential SEO link farm or content stuffing technique to mask malicious activity.

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.me/wix?keyword=blackjack+chart+printable
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_daf709f4c772486cbde61e62e75b0001.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ce5c42005af4c70bb00e2326beefddc.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_76833df5b61c439b91a15e66991cd3e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_317bc0550ebd4c2b950a42dea582c972.pdf
    • https://static.usrfiles.com/ugd/b8c837_40eb60b50abe44e692d1f16c1938b99b.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_f7c691d353b3434983e8baa39e7559f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd8cb8e1c4cd4295b0317805ad0c1e85.pdf
    • https://static.usrfiles.com/ugd/c7a620_7291a30b8b5a43ef9c61157bade94023.pdf
    • https://static.usrfiles.com/ugd/b8c837_3020d7d9c3fa4affaa29f456dc8a2463.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f1b9f5a88e84d1e847c33a712fe93b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c70b9d4424d8405bb3bda691be94c03d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eafda8cdabe4d9e95f107198542fcfc.pdf
    • https://static.usrfiles.com/ugd/b8c837_328a4f8703e14f3badfda2f94947749c.pdf
    • https://static.usrfiles.com/ugd/b8c837_476e506ee621455a999c44bbb08bdf8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_de4e80c054064e80a40c774c694587f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a911e26fe49407cb70aabc445ede21a.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_off000068dc.bin
44907536115f4b9b0f203e4f15a0257434248aa12377bb6ccf8f2c0c8b859daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 5172 bytes
font_01_sfnt_off00007a69.bin
6dfb21d8bdceffd8d413b9c2454d7faa402b220a3e99dd5002832ca91b24d2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A69 10352 bytes

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