Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f887632872b3abe…

MALICIOUS

PDF

104.2 KB Created: 2020-08-29 11:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93b9194738567344e5b6e44de616ab55 SHA-1: fd7fb7709bd3ea1bf8ce8e7dd85523f416fe59f1 SHA-256: 4f887632872b3abe3a3defbc5dca50f2e1ec734bae4e3f99f74874affa01274c
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=operation+trojan+horse+pdf'. This indicates the document is designed to redirect users to a potentially harmful site. The presence of AcroForm button actions further supports the malicious intent. No scripts were extracted from this sample.

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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/wix?keyword=operation+trojan+horse+pdf
    • https://static.usrfiles.com/ugd/b8c837_ba3326000c4c431b9463f4676d64e347.pdf
    • https://static.usrfiles.com/ugd/5ad03d_a79f9a85207c4f2189a48163d8d8db8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab4f9d48c22d494599d8e2ae0395aae7.pdf
    • https://cdn.shopify.com/s/files/1/0438/4659/8821/files/37409495203.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/economic_value_added_advantages.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51268900441.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/88920142565.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/all_audio_converter_apk_pro.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/bmj_case_reports_fellowship_code.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_off00015f98.bin
d82e9744a10028698ddaf589858483e1925b5332f2fd83215f89ab7599d166bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F98 5200 bytes
font_01_sfnt_off0001713d.bin
b02dc32c777975f1596a6622ecf7757525385fc6a3c979bd067f10a5b6ba44b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1713D 10160 bytes

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