Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb665ac447cc199f…

MALICIOUS

PDF

45.4 KB Created: 2020-07-21 10:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91ab5ee746eccd945a4b522539a79d44 SHA-1: 1ac2229a181bb2df0c5978e5491f0e6f35cdfd40 SHA-256: fb665ac447cc199f2e93e1cdce4498f18376e40804ab272432ae66b8761d5d44
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of these links, `https://ttraff.ru/wb?keyword=gathering%20blue%20study%20guide%20pdf`, points to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous links indicates a social engineering attempt to drive traffic to malicious infrastructure.

Heuristics 3

  • 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.
  • 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.ru/wb?keyword=gathering%20blue%20study%20guide%20pdf
    • http://files.kathysartplace.com/uploads/1/3/0/7/130739076/pibif_rapakuge_vogefov.pdf
    • http://files.stjohn23rdyouth.org/uploads/1/3/1/4/131438641/6009046.pdf
    • http://files.dmlimos.com/uploads/1/3/1/4/131438441/3fb7000c8854e.pdf
    • http://files.foreverhorsecrazy.com/uploads/1/3/0/8/130874510/fokezumofiwez.pdf
    • http://files.laurasarts.com/uploads/1/3/0/7/130775297/vufeligej.pdf
    • http://files.dmlimos.com/uploads/1/3/1/4/131438441/3fb70
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/19101702392.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/kanosofumesobuxejuwi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/60228994349.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/tekexapakeledegubudaguni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://vomujonij.files.wordpress.com/2020/06/kamarurumigogubukitarufog.pdf
    • https://vipodujenij.files.wordpress.com/2020/07/99078679133.pdf
    • https://lagupok392153502.files.wordpress.com/2020/06/tepomemebelet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/21733776709.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/punidawokojawixomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/riputakumajido.pdf
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/ruvabodojerareliwaxixig.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2818/files/67873690755.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/97025767464.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4974/files/59440024422.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/fujuderefabivesuf.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_off00007319.bin
3e262bb2435878649cdb296e4718714bb30c0f0de905cab6c864f53482523f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7319 5348 bytes
font_01_sfnt_off00008544.bin
d88478c0a4e15d8e80d52d4c70980ab0d6c13b57bffd31adaa8486a249ba558c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8544 10276 bytes

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