Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f4baeffaef3bab…

MALICIOUS

PDF

43.1 KB Created: 2020-09-13 19:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ceac59c896d31029bb9b89e6a87339c8 SHA-1: 3e64d3922119b56a4c9dfe6b7c263bc24d318fe3 SHA-256: a0f4baeffaef3bab3660d0d70d658c47af797c4d76549a9304ca9c61df6f0987
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service that hosts malicious content. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, disguised as an educational worksheet. This suggests a phishing or scam attempt to redirect users to malicious infrastructure.

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.me/wix?keyword=even+and+odd+functions+worksheet+with+answers In PDF document text
    • http://files.sabrinashandbags.com/uploads/1/3/1/6/131637953/rexat-biterop.pdfIn PDF document text
    • http://files.katherinemarieprice.com/uploads/1/3/2/8/132814906/7888902.pdfIn PDF document text
    • http://files.ottawarotarycalendar.com/uploads/1/3/0/9/130969879/lulakefotekasin-xupusuwusaji.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/1/0439/9969/0910/files/finding_perimeter_and_area_of_rectangles_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3890/7288/files/eu4_brandenburg_guide_1._27.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/resuduzadekap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/agradecimiento_en_ingles_formal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/rutedafanopox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/easy_piano_sheet_music_do_re_mi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9825/1170/files/75664188332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/20047260606.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/271e65_88c291d7c44d4e5fb61b0d7d3859bfea.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/370b54_f36bd111a4764a66a6ac1d0c0f4225b7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2c7c49_f9651a78d4274c1e96043895a243ab61.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/891219_40b91f6b4a404c5681adc91769cbbcb5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c068f8_70a364680a36421c882cca9f65cc88f1.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 5252 bytes
SHA-256: 622070d9c5cd98fe400efb28ab21ca6dd2eb74445d4d7025da97d0c2aca3ad71
font_01_sfnt_off00007bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFF 10584 bytes
SHA-256: 31bed45a10160635b432e0adcd75d506c831f0cb7856405cbc71532504eb90ad

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