Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f46069529891b47…

MALICIOUS

PDF

40.2 KB Created: 2020-08-08 22:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9e61207a6d0b1018a513d774ee56693 SHA-1: 72439ff2db409df28286be666e41c796b613b7c3 SHA-256: 5f46069529891b47b2fea356c29f32cd4a647dccf5b7f945aab26c1ad89da23d
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a 'telugu calendar 2020 pdf file download'. This is further supported by heuristics indicating a malicious redirector and a link farm. The document body, though heavily obfuscated, contains the malicious URL and other URLs that appear to be part of a link farm, some of which host PDFs. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=telugu+calendar+2020+pdf+file+download
    • http://files.buy-ephedrine-uk.com/uploads/1/3/0/8/130813588/924fa65465f57b.pdf
    • http://files.jsiegelart.com/uploads/1/3/1/4/131409009/dewowexugevazev.pdf
    • http://files.beleaflabs.net/uploads/1/3/1/4/131452735/5b40b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6120/6422/files/79908729202.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/simple_consulting_agreement_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/47546038325.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3212/files/livikenezemuzeten.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0714/files/gumukadifatutitodel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2254/0185/files/marewuxifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/33764536876.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/81962166806.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/erd_case_study_examples_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/fawekowawununo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/43217210102.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/wajexezavekirefovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0793/3603/files/classical_piano_music_for_dummies.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_off00005bef.bin
15c7856277ca1fc5c8fa8d124351c03122badce5d3ead9b43cd113cd434df653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEF 5460 bytes
font_01_sfnt_off00006ea6.bin
b9ba51b472b6d94fbd6b255d0225914f5186c6857e204d8694843aa90b1c36a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA6 10412 bytes

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