Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02476b757677ef1…

MALICIOUS

PDF

42.7 KB Created: 2020-08-19 20:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b4576014554e2f94dc854bad6196edf3 SHA-1: 2a41ab510e2d118641a3bc4d35c69d789b7fd108 SHA-256: b02476b757677ef16259bc99b316e84353fd5d54ced00f50c7887bd231d1ad65
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a redirector service. The document body suggests a 'spelling test' lure, which is a common tactic for phishing or malware delivery. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=sa+spelling+test+blank+answer+sheet In PDF document text
    • http://files.foreverhereforyou.com/uploads/1/3/0/9/130969166/tefurewemowef_tisawipafimubil_ledafitetujuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6319/7337/files/79134791228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7048/7702/files/adidas_marquee_boost_performance_review_weartesters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/93208443910.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/89022487367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/tafoju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4258/2176/files/chess_explained_the_queen_s_gambit_declined.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/mipowoxiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/meaning_of_leadership_styles.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5451 5480 bytes
SHA-256: 7692953bbed84a7af12650be1f0c957536a6570be7aa198754340b4165b4dbb7
font_01_sfnt_off000066fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FC 9812 bytes
SHA-256: aa64203557e4fa22d7caa4b5fc43f0f0fd10d8cef7adb24e6bc6c29fbe41cf5c
font_02_sfnt_off00007a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A88 10796 bytes
SHA-256: e78c941f2d7262d59b793b543dd3bb4b7f18f75849443946920db17903545398

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