Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2cb5e70c546c89…

MALICIOUS

PDF

36.9 KB Created: 2020-08-13 23:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1ae8cf8ea2cbd8a640ce0894001bbd SHA-1: 20265d54c9b95ed0202c20d1576296e169ccd45f SHA-256: 4c2cb5e70c546c8990c7a345f016bc493ef491ca1521dcdbef307ded46ae4830
170 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing, designed to trick users into clicking a link. The document contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it hosts a large number of external PDF links, many hosted on 'cdn.shopify.com', suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 36 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=bodyguard+2011+subtitle
    • http://files.endohealing.com/uploads/1/3/0/9/130969270/mazovupuw_juguko.pdf
    • http://files.socialvalueworld.com/uploads/1/3/0/7/130739715/gexozo-xemevuf.pdf
    • http://files.castleminiatures.com/uploads/1/3/1/6/131606094/kikibegetaxefuwok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8422/6453/files/wisuvupuxi.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/37560228998.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/kosexodugazarizepupuletiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2375/files/principios_de_asepsia_y_antisepsia_en_quirofano.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/tifomaboseruromewopilad.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/sugagolup.pdf
    • https://cdn.shopify.com/s/files/1/0440/5844/3941/files/8256904726.pdf
    • https://cdn.shopify.com/s/files/1/0432/3658/9730/files/guzagivupewaduxatude.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/pokudojorawesudofivudilab.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/cazadora_de_hadas_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/kupivujefu.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
stream_005_off00006ba3.bin
2230bd42c992c57c813e347c93cb183a0cff591d1be05b53d6cf9240fefc19dc
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6BA3 17372 bytes
font_00_sfnt_off00003d98.bin
81183cf330283a216ad44e7f210f5df572d44cb5ff5427f8a1305d34a4d12a58
pdf-font-stream PDF embedded font (sfnt) at offset 0x3D98 5608 bytes
font_01_sfnt_off000050c4.bin
d196a190268f31a9c90c3f35ce06645d4bc143c83c213e0d656caa2a8bcfb86d
pdf-font-stream PDF embedded font (sfnt) at offset 0x50C4 7856 bytes