Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d99306627c19362…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 07:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb8ffc14253012613b018c02080ce7bc SHA-1: ea0bb53ee60da7b0bb8dfe69cad35714913fa290 SHA-256: 4d99306627c193620a6ed5adf8702e6360f23b850db3d5621f114f8bb104c2a0
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to other PDF files, a technique often used for SEO poisoning or to distribute malicious content. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lure users to harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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=coping+with+grief+and+loss+pdf
    • http://files.destinationdelicious.com/uploads/1/3/0/7/130775106/kizakuvorejaxo.pdf
    • http://files.markeedamclean.com/uploads/1/3/1/0/131071167/2139b771c0.pdf
    • http://files.acadiaslevents.com/uploads/1/3/1/4/131410545/wivomi.pdf
    • http://tapefir.bestofbothworldsnc.com/uploads/1/3/0/8/130874478/vijoga.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/91352819518.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/gakofalojelug.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/linked_list_in_c_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/wuxedapiwarejaliko.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/gujarati_balgeet_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/1762/4990/files/67416205210.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/62585588095.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/besigunofofake.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/zujozetovotez.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8333/files/54726358439.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_off000063df.bin
006e355a4e3890985dd4b8e482129d3a07799862d0db46f412cbdb17c2118825
pdf-font-stream PDF embedded font (sfnt) at offset 0x63DF 5300 bytes
font_01_sfnt_off000075ee.bin
1a17af70f08e6986933c58464661308a3069a05bcbc6fffeb3bd1efc0d014a08
pdf-font-stream PDF embedded font (sfnt) at offset 0x75EE 9900 bytes