Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b7a5d6e1edce47…

MALICIOUS

PDF

47.2 KB Created: 2020-08-30 05:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f6c569a737f223eb4e4ec59af18bb1f SHA-1: 144ebcce2749f17442d3bc978e56b1aea0f020cd SHA-256: 90b7a5d6e1edce4702b410e8cafa231a35a5acb4388fb40fca0500567885836d
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, but the primary link directs to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=printable+staff+paper+large', suggesting a lure to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.com/wix?keyword=printable+staff+paper+large
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/supinaditadisoganekotopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0460/9556/4964/files/assentamentos_informais_em_mocambique.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/nagorigabovazetilesalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/tubonukijobafarokuweleses.pdf
    • https://cdn.shopify.com/s/files/1/0437/7421/4306/files/86015675654.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/bagoferuvoteki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/wivap.pdf
    • https://cdn.shopify.com/s/files/1/0436/4438/7481/files/witcher_3_greedy_god.pdf
    • https://static.usrfiles.com/ugd/8b9728_cc0e9bc58e624bc18515e28ebd1f63b3.pdf
    • https://static.usrfiles.com/ugd/913720_2573df94e578480eb3cc31663b920e77.pdf
    • https://static.usrfiles.com/ugd/b8c837_c073f7fb8983403b8d56dcbab6aafbb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cdb85e260694944968d6c7e18b42741.pdf
    • https://static.usrfiles.com/ugd/ddb60a_c3c7d26db8784ef6854fce469b4258e8.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/95674410259.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/twilight_edward_picture.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/png_stickers_app.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/24219716545.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/timuxasedejuvomepoxegu.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_off000079ca.bin
8cc3753b0614f994d7a216b2320fa6885cb64a524bd8c3331afd0a3ea62b141c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CA 5212 bytes
font_01_sfnt_off00008b88.bin
f06ae9bbbb147f9dda2387850b9160682a45c19be37662bde1ddb1fb3a132f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B88 10420 bytes

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