Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5d7edf09df33f9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-14 19:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d881394e4db700b61c59b10f3742463c SHA-1: 514b6bf58facf3fed3a7573ca065a2bfaf280ebb SHA-256: de5d7edf09df33f985d0a6a3185eb77b3a0e71b2295aadf59ad87935226b3e5d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same URL and a list of other URLs hosted on Shopify, likely part of a link farm to improve SEO for the malicious redirector. 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.com/pify?keyword=ultrasound+guided+supraclavicular+nerve+block+video
    • http://files.dglivestock.com/uploads/1/3/1/4/131437785/6688914.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/75256069852.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2201/files/vukenarasok.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/34147291111.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/jalagaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2364/6365/files/jufigizenufiwomelofoluz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/9882729674.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3768/files/top_bodybuilder_image.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/alveolos_anatomia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0434/8752/7078/files/pitipuxifudenakedage.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_off0000617b.bin
9a4e683fa48dee290eba8056827fe3a8dfe63ff4ebef3ef5c55aeb7ee069f742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617B 5496 bytes
font_01_sfnt_off00007434.bin
f0a0e53189aceba69ab697d3d903c25f86616be0c6f002e8357836ad5143a162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 13584 bytes

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