Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a8584d21261875…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 12:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 145d6cf9f7b5819cbb9c9a2150cc2341 SHA-1: ac05852ed1a855d8ef623682a760318167f50b17 SHA-256: 90a8584d21261875fbde88deaf6820d44592d5d49c7bfb585178e239a4507c9f
128 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to domains associated with link farms and redirectors, including a critical finding for PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to lure users to malicious content under the guise of providing free study materials. 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.
  • 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/pify?keyword=upsc+cms+books+pdf+free+download
    • http://files.devinadouglaslaw.com/uploads/1/3/0/9/130969012/2928185.pdf
    • http://files.perceptionofpretty.com/uploads/1/3/2/7/132710690/e19a1f0f56ffc.pdf
    • http://files.haciendasonoma.com/uploads/1/3/2/7/132740218/7130198.pdf
    • http://files.backpackingstories.com/uploads/1/3/1/4/131407012/7577899.pdf
    • http://files.richelleputnam.net/uploads/1/3/0/8/130813643/xemowi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/72640299798.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/1264360045.pdf
    • https://cdn.shopify.com/s/files/1/0446/9296/3484/files/13666932025.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/wizolotisoxenuragosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5059/7528/files/11099321198.pdf
    • https://cdn.shopify.com/s/files/1/0435/3979/2021/files/add_text_to_file_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0441/2253/8136/files/blastomero_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0438/3732/5462/files/87398799774.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81397135942.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/26604862609.pdf
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/71001880660.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/70005452737.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_off0000674d.bin
6b822f660409dc1820bd4336cd089406a587eca1656f7c5c57cc33277f7a3857
pdf-font-stream PDF embedded font (sfnt) at offset 0x674D 5588 bytes
font_01_sfnt_off00007a48.bin
7463eed855c600dd748a5a493ade396f4222a323f69084aaaebfeaa9e1e1eb67
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A48 10196 bytes