Malicious PDF — malware analysis report

Static analysis result for SHA-256 796b523fcb171fe3…

MALICIOUS

PDF

35.6 KB Created: 2020-08-15 13:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce28ca34b1115dd2290c9296fdf77f7 SHA-1: 33dd945cf9b33e86498aa5e10ad4eaecc5722149 SHA-256: 796b523fcb171fe32af443a1d5ca5d524ce3b9a8594bf945c07ef4e068b83236
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to a car manual, but embeds links to a known malicious redirector infrastructure. The PDF also hosts a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness.

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/wb?keyword=ford%20fiesta%202010%20titanium%20manual
    • http://files.laurasarts.com/uploads/1/3/2/6/132681342/nexixelurorul.pdf
    • http://lameze.ripplearts.co.uk/uploads/1/3/1/6/131606490/f978b514c9c99ff.pdf
    • http://tipom.kathysloanephotographer.com/uploads/1/3/1/0/131071164/lomepagutadivuv_tiwux.pdf
    • http://tosolopu.bulbgaria.com/uploads/1/3/1/6/131606577/vapivosuneres.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1149/6347/files/27401651320.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/prova_auditor_fiscal_do_trabalho_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/nudofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8588/files/84621503083.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/portuguese_language_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/6667099382.pdf
    • https://cdn.shopify.com/s/files/1/0434/8719/9394/files/pugowekug.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/rebumofipivoxipuxorasiluj.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/sarikajopudepa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0395/9720/files/double_column_cash_book_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/46930950978.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0471/files/10302122088.pdf
    • https://cdn.shopify.com/s/files/1/0440/7122/3446/files/34720164126.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d66.bin
2c9d6d50e0b26a7dbb1a8425a5a159be4d51b9f04dd52a2ed9a6a46dc5415fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D66 5336 bytes
font_01_sfnt_off00005f74.bin
d1de5e452fe15c4d5b72ac4526882a8518b23220c7732e001da8da9651846990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F74 9912 bytes

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