Malicious PDF — malware analysis report

Static analysis result for SHA-256 217bcaa1c44c9364…

MALICIOUS

PDF

46.0 KB Created: 2020-08-12 22:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23eac5f2d4e8132bc119cbededec91db SHA-1: 7904a759770cc847255f52783a8aec95ffe9ea75 SHA-256: 217bcaa1c44c9364af7fcb74316df9d5cf2d3941873c48333387ecd45b2e5a12
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the PDF is designed to lure users to malicious infrastructure, likely for further exploitation or credential harvesting.

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=l+adjectif+qualificatif+attribut+et+%25C3%25A9pith%25C3%25A8te+pdf
    • http://tifelejoj.teensvillerecords.com/uploads/1/3/2/7/132740353/ade112e240b8e23.pdf
    • http://files.stacyrosedance.com/uploads/1/3/0/9/130969265/628d949.pdf
    • http://donedox.adelesphotos.com/uploads/1/3/1/4/131453494/12f6322f.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/31993973548.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/81295634924.pdf
    • https://cdn.shopify.com/s/files/1/0433/5593/0783/files/calculator_tricks_and_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/7612454076.pdf
    • https://cdn.shopify.com/s/files/1/0438/0311/5680/files/45878997632.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/54597211037.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/charlotte_s_web_packet.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/centroid_of_all_shapes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/fekuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1285/files/gavuvatu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/folizuxuzeje.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/herramientas_de_bsqueda_de_informacin.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_off00007147.bin
0f4157fcb2d0032b551b9e31d33406c87cbe35aca3a722f7c8a557e19a7d2670
pdf-font-stream PDF embedded font (sfnt) at offset 0x7147 5632 bytes
font_01_sfnt_off000083c6.bin
882fd6619a7eb81aeaa428ab7cb4cbeecb8a9e218684151caa1b7e0bbb5a16be
pdf-font-stream PDF embedded font (sfnt) at offset 0x83C6 11560 bytes