Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37c81be46d47ea4…

MALICIOUS

PDF

65.6 KB Created: 2020-08-10 23:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6ea817f481220fb8a4fa5b7b17243f3 SHA-1: cd9c950a3792c5d690d9550d250cc0fc927b3600 SHA-256: c37c81be46d47ea460f71c6841569e5d493e8fab9172f6f0db8be8506d342fe4
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=carrom+rules+pdf'. This suggests the document is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing. The presence of a large number of external links, many pointing to Shopify domains, indicates a link farm strategy to improve SEO and potentially mask malicious activity. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=carrom+rules+pdf
    • http://files.floridabookreview.net/uploads/1/3/1/6/131607062/liluj-rarefefu-paxat-bisole.pdf
    • http://wojixuxiz.petrocellicaffe.com/uploads/1/3/1/4/131453134/a77de101e8.pdf
    • http://files.theedgesalontxk.com/uploads/1/3/0/9/130969431/3112499.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/lightroom_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/tirosanimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3934/2248/files/document_to_converter_software_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1223/files/using_paradox_in_a_sentence.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/important_questions_for_class_12_hsc_biology_chapter_wise.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1615/files/homogeneous_catalytic_hydrogenation.pdf
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/kubota_bx2230_operator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3059/files/daedalus_and_icarus_full_story.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/52782511546.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/support_vector_machine_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0438/1193/0274/files/9862372393.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/nero_star_smart.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
font_00_sfnt_off0000ba5a.bin
76c609b2e631828f591d1ac57102b371cae19c86efef3e3e0cd2759a9a844255
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 4860 bytes
font_01_sfnt_off0000cae3.bin
604b2408c41aed29c87debe677a4c84998c1d33028692f64626aadcb53e87a0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 9600 bytes
font_02_sfnt_off0000ebbe.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 4324 bytes