Malicious PDF — malware analysis report

Static analysis result for SHA-256 33004bdc6585bdbb…

MALICIOUS

PDF

59.0 KB Created: 2020-07-29 18:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ef0fa10098b6a8f30daca70385448bb SHA-1: 4d6ec1d0b5d1fc92d6eb37fc744ab971661fb75f SHA-256: 33004bdc6585bdbb66919a2152ed91c66bdc5b14dd868f53c3d98aa038a5505a
120 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link directs to a known malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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/pify?keyword=cefr+diagnostic+test+pdf
    • http://files.commsailpistakee.org/uploads/1/3/1/3/131381003/7255338.pdf
    • http://files.creativebeginningsllc.com/uploads/1/3/2/6/132681359/wejodegezi.pdf
    • http://files.blackgypsymamawagon.net/uploads/1/3/0/9/130969652/7376190.pdf
    • http://files.thewanderingbays.com/uploads/1/3/1/0/131070112/rukavijeb_biziwet_buxaninumef.pdf
    • http://files.acherrymoon.com/uploads/1/3/1/6/131636834/budaninulimete.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/xajexiwebugusimumizegotix.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/35092565120.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/32331237993.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/wexijumujod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1197/3026/files/30407479905.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4134/files/78896267971.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/94306246780.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/41671098204.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/31100019256.pdf
    • https://cdn.shopify.com/s/files/1/0432/2711/9784/files/wazuvitiledutadujonenofu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/80976867707.pdf
    • https://cdn.shopify.com/s/files/1/0438/4751/6325/files/zawevifisixorudevivasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/lanudasunovowamipakob.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_off0000a9c4.bin
d2aea040c9687c9f3e8e3ba01aecf0d76b9b29109fa4ebdb6f91761ef0c9e8c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C4 5104 bytes
font_01_sfnt_off0000bb35.bin
95aae827dceba51d9dc260d9106f0667706127d7a1cebf19bb0f069bdc749622
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 10484 bytes