Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f54f5b315ed2ec…

MALICIOUS

PDF

42.1 KB Created: 2020-08-14 07:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fa2431145e49c7ead8a8d4c625cd95a5 SHA-1: d7656030879eb9f593d5bf075e4a509497ff052d SHA-256: 87f54f5b315ed2ecc5428ab36916c0c2aaf05ec7dd6ea64c9aff7c82dac354eb
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating an attempt to lead users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download' lure further supports the phishing attempt, likely leading to a second-stage download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.cc/pify?keyword=non+chronological+report+examples+year+3 In PDF document text
    • http://files.ratiocoffee.ca/uploads/1/3/1/3/131381607/02d2e1c0d7579.pdfIn PDF document text
    • http://fewawoje.classes.interactive-maths.com/uploads/1/3/0/8/130873995/5400375.pdfIn PDF document text
    • http://nekaxolub.abc-vermontnewhampshire.com/uploads/1/3/1/4/131437044/e6db0e3925.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/1/0429/5327/7589/files/royalty_statement_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/6172/7647/files/club_penguin_membership_codes_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/cateye_strada_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/7731/5233/files/91607320428.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8850/3203/files/74568326210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/actaris_sl7000_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/sudezurok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4547/7800/files/antibiotics_safe_during_pregnancy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3791/2214/files/19943552889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/51475090405.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/pair_of_kings_theme_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/rujadudumevipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/pizazubenanuwezira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jidaxuno.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
🗂 Part of campaign: interactive-maths.com 4 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6604 5652 bytes
SHA-256: 24e784764fc083db5ad0b65fd9e00c037dc440f144a9107454bdbe07c45d9895
font_01_sfnt_off00007913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7913 10144 bytes
SHA-256: 8b91311d57a8ff55e2c99d07ef03bd4592d41f2279c05649104b9b2b8a6c0c56