Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1a751d85a492f2…

MALICIOUS

PDF

41.2 KB Created: 2020-08-19 08:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44382621248836253d8f61819a4ed7db SHA-1: 29e8308769b76c2c7d3cdbd8a57dbbc09431fac0 SHA-256: 6f1a751d85a492f256737c5f9baba90105a3ccdc782eed93429054844626a48f
162 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.com, which is presented as a download for 'Vidmate old version 2.56'. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malware or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=vidmate+old+version+2.+56
    • http://jubuw.felixstoweprimaryschools.com/uploads/1/3/1/4/131438500/4417925.pdf
    • http://files.honeycreekgoldendoodles.com/uploads/1/3/1/3/131380175/pupixul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8632/2593/files/37170279938.pdf
    • https://cdn.shopify.com/s/files/1/0434/5715/1142/files/pimamijamejijurufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9523/6513/files/first_grade_math_worksheets_addition_without_regrouping.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/16667596488.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/39575586801.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/befokekavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/dark_magician_girl_shimeji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupesoxozuwimufuvijolus.pdf
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/farmacos_antiarritmicos_y_antianginosos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1606/0061/files/nice_guidelines_dementia_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/39271964120.pdf
    • https://cdn.shopify.com/s/files/1/0438/0295/1842/files/6843568342.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_off00005b3a.bin
4ff6afc1f3af69290d6014cacbf828a281dd570e176304bd7593b0d33ae65bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3A 5436 bytes
font_01_sfnt_off00006daa.bin
8e0502cba14a7ca0cdfcea35a08e9f02f2752fb7c7c1df3c6ea4f761433313c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAA 13600 bytes

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