Malicious PDF — malware analysis report

Static analysis result for SHA-256 70da87322e289710…

MALICIOUS

PDF

41.0 KB Created: 2020-08-22 13:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7bea30c58c71aaa885be0755d1568a SHA-1: 74beef7b16ef2ca4bb0645404cb8fafaea616a14 SHA-256: 70da87322e28971073e7b18e190f22f52c2adee9719a74bfa8dad26facf5a509
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a movie, suggesting a phishing or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of redirector links supports this assessment.

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=antisocial+2+movie
    • http://depiri.loftconversionsmerseyside.co.uk/uploads/1/3/0/9/130969762/5ff063bf19.pdf
    • http://files.jamaxe.com/uploads/1/3/2/7/132712006/00181dd999ab.pdf
    • http://files.singingtreemidwifery.com/uploads/1/3/1/4/131407818/1902655.pdf
    • http://files.sunflowerpreschoolsebastopol.com/uploads/1/3/1/0/131071157/8271948.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8011/2545/files/dekewujepojopuviwapovod.pdf
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/colloquial_phrases_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/87273368794.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/23005764021.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/jazelakapezatex.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/70473955367.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/ponepato.pdf
    • https://cdn.shopify.com/s/files/1/0462/7241/3856/files/64679604739.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/drag_me_down_guitar_chord.pdf
    • https://cdn.shopify.com/s/files/1/0432/0221/6093/files/pelogolizobesiwoxabe.pdf
    • https://cdn.shopify.com/s/files/1/0441/1860/5976/files/adobe_photoshop_7._0_computer_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/puvanejozonefasapovufala.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_off000065f2.bin
f12ced017103132056ce876c7eb6c0aba2becc82691952ecd76dd2b7d5ec829f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F2 5028 bytes
font_01_sfnt_off000076fa.bin
3d69ab2444c153f6daec7cf502138f1fa6ac67b5ab2f2590833264b5bc4dadbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FA 9508 bytes

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