Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b12673025f0ab1…

MALICIOUS

PDF

36.6 KB Created: 2020-08-09 15:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9eca14b9a491f84b8de60230a1d41b4 SHA-1: 6b31cb59210cd415776e67913397fc3732b58852 SHA-256: 40b12673025f0ab168722366d9f780af6771e2b1a6e37d7215300978f0ab0297
154 Risk Score

Malware Insights

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

This PDF file contains a significant number of embedded links, forming a link farm. One of these links redirects to a known malicious URL, ttraff.ru, indicating a potential phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated.

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=bye+bye+blackbird+piano+pdf
    • http://files.stevenageandknebworthartsgroup.com/uploads/1/3/1/4/131437457/gexanazako_xonidofi_roxikoromosi.pdf
    • http://files.themassageplaceop.com/uploads/1/3/2/6/132696500/zinowejebire.pdf
    • http://gitin.drdarrencbrennan.com/uploads/1/3/1/6/131606490/88080cae6e6d.pdf
    • http://files.emsinsider.net/uploads/1/3/0/8/130874352/kiwolebuxikil-xaxojakonoz-lasixafoduko.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/21112666470.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/variedad_de_cafe_costa_rica_95.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/biometry_sokal.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/vagepuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9936/files/flora_agaricina_danica.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7266/files/39079534966.pdf
    • https://cdn.shopify.com/s/files/1/0439/4418/1928/files/81044077625.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/65833000844.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/wuxowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/seismic_acquisition_and_processing.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/10256882450.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/10311506795.pdf
    • https://cdn.shopify.com/s/files/1/0436/1607/5939/files/lumilume.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/25030127229.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_off000050c2.bin
ff0545361bd24ae0ecbf4423a77389df6ba4c5ef6e1c9c2d8a1f86560137af81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C2 5328 bytes
font_01_sfnt_off000062fd.bin
5bcc1f4e00d810da52198a243688576a862c2aa77b7eb24d8622ef7bc0535957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 10120 bytes

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