Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8ce845c9dac8bb…

MALICIOUS

PDF

39.5 KB Created: 2020-08-16 23:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 961aa5be2e6f1f3e355059957ba43090 SHA-1: f7c7656ce2e1bbd27668f933cb9213dcdd2115be SHA-256: 5b8ce845c9dac8bb4af47d9663fe59de0cc672d0df306cc2c579501b2e951bc2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) which is flagged as malicious. This suggests a phishing or scam attempt, likely using the 'free download' lure indicated by the SEO-optimized filenames. The ML classifier strongly supports the malicious verdict.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=chopsticks+easy+piano+music+sheet In PDF document text
    • http://files.videoheads.co.uk/uploads/1/3/1/4/131408100/8c5dba02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/bisiwukew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5962/6655/files/circulatory_system_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9163/9974/files/logical_reasoning_questions_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/99530557163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/vopaxir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/metejujajuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/50341300217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4999/2860/files/konejuwevekukawurolobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/check_mark_alt_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7685/9557/files/altova_xmlspy_tutorial.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBC 5116 bytes
SHA-256: bd782673c35f005048fd2643c0c5e9480f0ec218460cffb84bee3b33a6bd52e2
font_01_sfnt_off00007001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7001 9780 bytes
SHA-256: df98106816dcb79787f8707ca89a0a249b3c156b53b280ed22290c616ec7287e