Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbbbb25ca8ee779…

MALICIOUS

PDF

50.6 KB Created: 2020-08-13 13:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06db95deed79d5549dbefe97f15052d7 SHA-1: 666027962eefa28cea5a585ec7fe51734a17ec76 SHA-256: 3dbbbb25ca8ee7792596050124a61c9e851f1d6463a824f47086140640214a33
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic indicating it is a malicious redirector link, pointing to a URL associated with a known malicious redirector. The document body and embedded URLs suggest a lure to download textbooks, which is a common social engineering tactic. The presence of numerous external PDF links further supports the classification as a link farm, likely intended to drive traffic to malicious sites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=anesthesia%20textbooks%20free%20download%20pdf
    • http://files.madebeautifulby.com/uploads/1/3/2/3/132303219/nudaruwavofotu-mutajotus.pdf
    • http://korupogad.codlantic.is/uploads/1/3/1/4/131437826/rifuwotu.pdf
    • http://files.cobh.coralleisure.ie/uploads/1/3/0/9/130969999/vaduzabemofas.pdf
    • http://files.mackenzywatsonsportfolio.com/uploads/1/3/1/8/131857655/4715870.pdf
    • http://sogalo.fshockeyacademy.com/uploads/1/3/1/4/131438096/0f4f36623acb1bd.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/36233565881.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/panisonic_fax_machine.pdf
    • https://cdn.shopify.com/s/files/1/0437/4947/4453/files/arnhem_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/zukemofelov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/65556764403.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/26123238590.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/62272699948.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7122/files/16561893172.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/39261835341.pdf
    • https://cdn.shopify.com/s/files/1/0452/3776/4256/files/isquemia_cerebral_transitoria_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/41237697524.pdf
    • https://cdn.shopify.com/s/files/1/0434/8428/3033/files/3152476736.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_off0000877f.bin
02b9d0261d19e8fd7fb61dac6125b29a816f9e5a07bf0ed02ea9ea2d8cbdf0ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x877F 5484 bytes
font_01_sfnt_off00009a23.bin
b540e2d4fa38fa3eb023ee49c0dc8dfa4947d221d5b2296665d4c6f7d5f9dc5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A23 10312 bytes