Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec93398bbf4a674…

MALICIOUS

PDF

48.7 KB Created: 2020-08-02 21:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8dfa58e55a89bf456f59bc2222240d SHA-1: 013069c36716ac62768831ca50de6175f00cc9db SHA-256: 6ec93398bbf4a6748f6f057b2049816251907b747677d9f7e20f90d7c40a84c5
194 Risk Score

Malware Insights

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

The PDF contains numerous invisible links, with at least two pointing to CAPTCHA-themed lures and others to a known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the sample is designed to redirect users to malicious sites. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content.

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.cc/pify?keyword=clear+entities+minecraft
    • http://files.emmaunderwood.co.uk/uploads/1/3/1/3/131384636/a882f88a.pdf
    • http://files.lisbonfallsnazarene.com/uploads/1/3/1/6/131606056/181d6f07.pdf
    • http://files.ccmomc.org/uploads/1/3/0/7/130738852/5919177.pdf
    • http://files.felixschuster.org/uploads/1/3/2/6/132681865/9962f7fc0685a1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/norim.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3525/files/jinefijurotarojidababeteg.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/jomiromo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/90976552605.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/vujapedutegobuzotesu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/68819524961.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/legenanimokatime.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/convert_captcha_image_to_text_github.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/14697957503.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/zejibakamezog.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/medulefapovine.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/tidizotutubanifeseloru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007447.bin
493133c3f72aeaab7d240230fc37e4a6c8ef85c5fff8b8f647a39280bfff660f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7447 4728 bytes
font_01_sfnt_off00008430.bin
acfc56290e3117661dcb055c6a0491cb6a4e888dc36e2ba991086e5c5ae9e6c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8430 10460 bytes
font_02_sfnt_off0000a7e7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E7 4324 bytes

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