Malicious PDF — malware analysis report

Static analysis result for SHA-256 828f3f68a976ce40…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 02:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f1324d82a13b5c3ed3671a3126032c32 SHA-1: 0abda1e60ab7dd4537b233b63b37c633e2dbcafd SHA-256: 828f3f68a976ce4002958c3947acbbec32b29bc06fef0677b02886496f880dfb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains text suggesting it is a lure for IELTS academic reading test samples. The primary malicious URL identified is a redirector that likely leads to further malicious content or phishing pages.

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=ielts+academic+reading+test+samples+with+answers In PDF document text
    • http://files.caasfepconference2020.org/uploads/1/3/1/4/131454316/3755089.pdfIn PDF document text
    • http://files.laurenrodolakis.com/uploads/1/3/1/8/131856703/nozitaroberawen_lanonerabufag_fulopukizizuru.pdfIn PDF document text
    • http://files.tntdeesign.com/uploads/1/3/0/7/130776503/jawipuk-bonusotiv.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/1/0435/1442/9608/files/demisanakolaxowefutanas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/levodoxukanijeto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotalufakelani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/zonigese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/nezik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/barron_s_act_practice_tests.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/97674918562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0826/2297/files/shimano_deore_lx_schaltung_einstellen_anleitung.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/41199931664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/nasugikado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/27117656042.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2357/8774/files/98720578594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/mugadobunaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/61129967127.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_off000058fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58FD 5516 bytes
SHA-256: 99eb4b7616ebd4569958dcb6f3ee6a21538958c6dbff480ed250a213b36a161d
font_01_sfnt_off00006b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B98 14560 bytes
SHA-256: 6d9a26231161ff38acb2482a589f59ad6d265f5996578ba4511ec5c888b133b6

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