Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa27cb21ed3593a…

MALICIOUS

PDF

156.0 KB Created: 2020-08-19 21:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c844057d3a0f0fff1a836526565ff996 SHA-1: 662aecccdf71543894d4eee906c02b87c74d620b SHA-256: 5aa27cb21ed3593a3c68ff47aa5aa91c574c6baf0b62af6d47a8405883e247ac
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text related to a 'Deepwater horizon disaster report' and includes the malicious URL, suggesting a phishing or social engineering lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=deepwater+horizon+disaster+report
    • http://kozuzuno.bzdickstudio.com/uploads/1/3/1/3/131379730/kabub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4430/5056/files/dibivimuvewarebefuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/89150756952.pdf
    • https://cdn.shopify.com/s/files/1/0438/4679/5414/files/21260821912.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/nerf_alpha_trooper_cs_6.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/chrono_trigger_crimson_echoes_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/english_news_paper_download_today.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/berger_easy_clean_shade_card.pdf
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/zuvukurotagix.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/kutize.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/important_vocabulary_english_to_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/tofexotuzedazobozifugoko.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_off00022c77.bin
7ab03e03a204c0222c02ef7289d6e320003427ebdc7192a6c23b932bd683f40b
pdf-font-stream PDF embedded font (sfnt) at offset 0x22C77 5156 bytes
font_01_sfnt_off00023e19.bin
54702d46fea9f8899611bbcb53847a527072c8bc69c208cae446b93ff4b9ac1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x23E19 10736 bytes