Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dcaf92d2735653…

MALICIOUS

PDF

41.9 KB Created: 2020-08-13 14:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98af39dbc6d7eb2cba110db8f50ead2d SHA-1: cfbc189958e56d7d9d4f767274340384a2443629 SHA-256: 58dcaf92d2735653becf163b6f694c41ffa79037a10bb97f8a28f25c11d3d797
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external PDF files, characteristic of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=sirup+belimbing+wuluh+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious content. No scripts were extracted from this sample.

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.cc/pify?keyword=sirup+belimbing+wuluh+pdf
    • http://vejadipux.compassionsfireministriesinternational.org/uploads/1/3/2/7/132741099/8455974.pdf
    • http://files.gloscamsoc.org/uploads/1/3/1/4/131453934/bofopobazek_kufalekokiva_fereralogevules_bagebudunumusen.pdf
    • http://musorigo.cdastars.com/uploads/1/3/1/6/131637016/nimimajewopoxegonud.pdf
    • http://files.danaparalegal.com/uploads/1/3/1/6/131606128/lurutadu-gujufuj-bevavapesewora.pdf
    • https://cdn.shopify.com/s/files/1/0429/1257/9747/files/aimpoint_golf_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9654/files/gipelodubelotowodujizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/ejercicios_con_angulos_complementarios_y_suplementarios.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/jonuvipikole.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duzawubemamomavokam.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/water_level_sensor_arduino.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9402/files/pelisegiwusazi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/zedigagadoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/rofirolefefunezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kofuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/jitanipaseranigenagigit.pdf
    • https://cdn.shopify.com/s/files/1/0436/4120/8992/files/mil_canciones_andres_cepeda.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_off00006763.bin
e7870ed47e3bc9d6faa0d4f36a893ce3711ee5b6544dd4adcea7d6a7725304df
pdf-font-stream PDF embedded font (sfnt) at offset 0x6763 5404 bytes
font_01_sfnt_off0000799c.bin
75cdea0781cec239bb96e7ef21997651e8ccc34bcf236af012aa6cb46fed152e
pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 9752 bytes