Malicious PDF — malware analysis report

Static analysis result for SHA-256 733b9dda526c9bc8…

MALICIOUS

PDF

51.8 KB Created: 2020-08-05 23:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ce04d1a29259d17ec28a91aecf211a63 SHA-1: 2de4f13fb9d6f4f4aed6904560eea38b50e817cf SHA-256: 733b9dda526c9bc8ef820b0391a433e4a9db30ab56428815c2d48fa0251e270f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting a phishing or scam attempt. The embedded URL and document body text point to a lure for a 'free download', which redirects to the malicious URL https://ttraff.cc/pify?keyword=html5+bangla+pdf+book+free+download. 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.cc/pify?keyword=html5+bangla+pdf+book+free+download In PDF document text
    • http://files.jlhopewindsofpoetry.com/uploads/1/3/1/4/131438676/4988529.pdfIn PDF document text
    • http://files.changelearning.ca/uploads/1/3/1/4/131437865/1929610.pdfIn PDF document text
    • http://files.morningsidechildrenscentre.com/uploads/1/3/2/3/132302814/guvavobipix-kibix-kariti-koximoxon.pdfIn PDF document text
    • http://files.sandracrawford.com/uploads/1/3/0/7/130738943/56d9d.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/1/0432/0185/5646/files/82832951867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/3192715330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/kelas_scaphopoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/18728915088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1624/7703/files/nuzasoduvawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3868/7900/files/vaxukibebujitimotijoxufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/40935314852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9649/7573/files/cannula_insertion_procedure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/26682845840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/13831602529.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 7

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_off00008b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B24 5564 bytes
SHA-256: e343e22970bae7dfb01a5a933b19af4bb4f127c0e7d34976b49db310126246b7
font_01_sfnt_off00009e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E0D 10492 bytes
SHA-256: ea980d8feb60ac4b95ea9699b9783fe26a94cffa785f002c48044c5f54ce7a2c

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