Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c4425beac6649f…

MALICIOUS

PDF

46.3 KB Created: 2020-08-13 23:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0802cca86fec1e5034acc1cbf95e49e7 SHA-1: ac3c68e598b634e9ffa3b4786cf7803ce0a08877 SHA-256: b4c4425beac6649f72ee7ca734e5400e6cfd622e0c54712b24a6211db30a4e8c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector at 'ttraff.com'. The document body, though partially corrupted, contains text related to a 'Michigan durable power of attorney acceptance form' and the 'wkhtmltopdf' generator, suggesting a lure to disguise malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links, including a large number hosted on Shopify, indicates a link farm or distribution network.

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/pify?keyword=michigan+durable+power+of+attorney+acceptance+form
    • http://files.graceyourspace.co/uploads/1/3/0/8/130813528/6dd908332.pdf
    • http://files.stannjan.com/uploads/1/3/0/7/130740177/a21ef81f6c.pdf
    • http://files.wisdomboulevard.com/uploads/1/3/0/8/130814169/130871af9e62eea.pdf
    • http://files.margiehauser.com/uploads/1/3/0/8/130814387/padewigunosiful_gefanixomapabo.pdf
    • http://files.joyuzsong.net/uploads/1/3/1/4/131406149/widanomaler.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/25540179432.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/satavinexivareruvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/30293876855.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4312/files/sinajirudimobupapuweziba.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/42749956604.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/dr._wayne_dyer.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/gujoborikobipudavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/23125661423.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/castle_floor_plans.pdf
    • https://cdn.shopify.com/s/files/1/0437/9652/9314/files/hernia_de_disco_cervical_c5_c6.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/19583827360.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_off00006117.bin
190feaa2bf60b4717ffbc151edc8a2ed04a948cbd80d79e1770466c475de10aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6117 5728 bytes
font_01_sfnt_off0000747d.bin
5b79413c0a0778b84e4db9de424111a79c1e348489b17957fafdf4ef569aaf0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747D 12784 bytes
font_02_sfnt_off00009dbd.bin
703ddfce44283fcf2ddbe85e0a9848bd8e9e47ed6e5cab56f548db852c290165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBD 3496 bytes

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