Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b971f6ae860c3b4…

MALICIOUS

PDF

44.9 KB Created: 2020-08-19 10:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec01798787546ee268452fc878372e0 SHA-1: 46a06c350077925d94cd7353e77bf6d2fccc5fc0 SHA-256: 7b971f6ae860c3b4b60d059355a08d61bd794ac378affcbb1462715170dbe5dd
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or redirection to malicious sites, rather than direct exploitation within the PDF itself.

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.ru/pify?keyword=format+code+js+sublime
    • http://files.carsonfootball.com/uploads/1/3/1/4/131437987/kogigerivuwav_vomot_puxinemuwekotaz_nunogenikawit.pdf
    • http://files.stalbansdavenport.net/uploads/1/3/0/9/130969424/5f53c833fa.pdf
    • http://files.californiawestgroup.com/uploads/1/3/0/9/130969932/zumavakuwes.pdf
    • http://files.arkansascloggingcouncil.com/uploads/1/3/1/4/131412032/2bede96.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/96207048454.pdf
    • https://cdn.shopify.com/s/files/1/0434/1900/9173/files/bach_fugue_in_c_major_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/5751/1590/files/36709032679.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/45181753658.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/97624763103.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/18361515739.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/duzedowifidagujabovubifam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9981/6090/files/94874774471.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/xaroverapufizuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/3158909822.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/bewonelepebikenim.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/biruludanur.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_off00006f70.bin
c4371dc0de963fcc76337bff1bc36dfeabeb62989bec502ceb852acfead1cf38
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F70 5256 bytes
font_01_sfnt_off00008132.bin
76fda53024f39f5d028a2bcd367530edcd1a9db068e717b1bca979cc3ec9000d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8132 10848 bytes