Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a66d141285a10a9…

MALICIOUS

PDF

36.1 KB Created: 2020-08-16 22:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c0f23cb1e96085c22491c689985437b5 SHA-1: dda46c8a2c49a321738cab09b69ac676326e8f81 SHA-256: 4a66d141285a10a9f8d1d632a78feec555b7e7ff0a9420a09a91e8538107b2b3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=character+types+worksheet+1+pdf'. The document body, though heavily obfuscated, contains text that suggests it is masquerading as a worksheet, likely to trick users into clicking the malicious link. 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.com/pify?keyword=character+types+worksheet+1+pdf In PDF document text
    • http://files.selffound.net/uploads/1/3/2/3/132302711/sodikowalob_rerakovebogepuf_wulofelajeg.pdfIn PDF document text
    • http://files.stinesfitness.com/uploads/1/3/1/6/131637306/8472244.pdfIn PDF document text
    • http://files.benmoorestudio.com/uploads/1/3/2/6/132696104/sumatibef_dimuvubegabumaw_bomenenazipe.pdfIn PDF document text
    • http://files.mitchelltdavey.com/uploads/1/3/0/8/130873794/bazova_ravipilosop_wexeki.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/1/0431/9612/1248/files/come_aggiornare_app_su_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/59985078746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9632/4761/files/81684422739.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/bitaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0631/1070/files/dasadinozuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/pajuge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/319051996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/hemorrhagic_cerebrovascular_event.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/25916344810.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_off00005099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5099 5424 bytes
SHA-256: a6e8cd4e54172c382e6741242b2cdf8a910728e72ae545c18f97ebf818a1ae99
font_01_sfnt_off00006320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 9852 bytes
SHA-256: 49693c992e803be2646d6ec757acf281016ac07594b9ef3c2d06c6ca8a26ce95

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