Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68599cbe8350ffa…

MALICIOUS

PDF

34.8 KB Created: 2020-09-06 19:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f587791d02d66e7fa8b52d5527e1f385 SHA-1: 4ec6b42393a68c8b067449b070bd11e058a5d943 SHA-256: d68599cbe8350ffa25ade6611d130505ccf86aa16ac105570e4bb84151d13b90
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.link'. The document body, though heavily obfuscated, contains text related to a 'Dell 760 bios update' and includes the malicious URL. This suggests a social engineering lure to trick users into clicking the link, which then redirects to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely for SEO poisoning or distributing further malicious 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.link/pify?keyword=dell+760+bios+update
    • https://cdn.shopify.com/s/files/1/0436/2010/6404/files/free_hidden_object_games_unlimited_play.pdf
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/somefumon.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/jewelanedasamuwuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2454/files/online_converter_jpg_to_joiner.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/79191276411.pdf
    • https://static.usrfiles.com/ugd/b8c837_2194ea78d2544d08ad7d57aa5fd3d928.pdf
    • https://static.usrfiles.com/ugd/429b25_e2fcf5096066493ba7d0d0c87a18345d.pdf
    • https://static.usrfiles.com/ugd/b8c837_65f5a4aa69d9414ab67941a57846e3ee.pdf
    • https://static.usrfiles.com/ugd/c722c2_695fbbe51f224297a0d5ad1fb19d55ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_57a055deee8445489e7134244864cbe1.pdf
    • https://static.usrfiles.com/ugd/a76634_f1fb8ef6cc184451a0b8bbb8de193001.pdf
    • https://static.usrfiles.com/ugd/b8c837_122e1e087e424ac288b4628b73147528.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_4696f45111e3426aa4a1b264bc2f73d7.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/ps_form_8076.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/4277951932.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/47067098595.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mozinetesabelenigifil.pdf
    • https://cdn.shopify.com/s/files/1/0438/4948/2400/files/temib.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_off00004af0.bin
bd7c715a0e1138cb29250358d5a7743075460a7d699f895a5755ef8e0bcc5f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF0 5372 bytes
font_01_sfnt_off00005d42.bin
74c884da893b06ccee4a2dcb9e4c7351ccaa70e47caa745de7b1ee6c527b75eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D42 9740 bytes

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