Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fc213bbefe407c…

MALICIOUS

PDF

39.6 KB Created: 2020-08-23 08:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc95e206ebd04392c7ed7b9cc11e06c4 SHA-1: 5dd3463ca14b181d1d01911aca2a2e18fac19bbc SHA-256: 15fc213bbefe407ca3bf7b5608e8996e86231eb4aa84d4cc3098706bdff99a2d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains text that appears to be a lure for a "photo maths solver apk". The presence of numerous external links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to increase visibility of the malicious redirector. No scripts were extracted, but the overall structure and malicious link indicate a phishing or redirection attempt.

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=photo+maths+solver+apk
    • http://giwix.sacredheartyouth.org/uploads/1/3/0/7/130775085/mojuwuzunuj.pdf
    • http://files.galleriasaba.com/uploads/1/3/1/3/131382841/setumaw.pdf
    • http://files.zandugandzic.com/uploads/1/3/0/8/130874683/wikilaluvifisufuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/71680571698.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/dakigagomopelawavorubiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/pupedaxarifiridodebiwul.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/corporate_finance_multiple_choice_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/60672580512.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/prehospital_emergency_care_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/vibifexeluwobutilab.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/suwimufileviw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/auditing_notes_for_south_african_students_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5482/5621/files/79906784890.pdf
    • https://cdn.shopify.com/s/files/1/0429/2562/1404/files/66994099977.pdf
    • https://cdn.shopify.com/s/files/1/0452/1954/5245/files/95094514147.pdf
    • https://cdn.shopify.com/s/files/1/0431/9107/4976/files/90839090275.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
52055f930478ef02251d2851dddaaaba0c8a33fcf63fd0516fdde3dfe6d4f56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3A 5184 bytes
font_01_sfnt_off00006cbb.bin
a858e2e118555a12ad4c24cef1de466709bf00c0e8f8a3616e540c94ba50d7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 11032 bytes

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