Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccdd628787b836f…

MALICIOUS

PDF

57.0 KB Created: 2020-08-16 14:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dafab5f2f5111f9c47d0ea825d5eb398 SHA-1: bf8942c69b6f242fdadbe2e39e52068bb3de653d SHA-256: 3ccdd628787b836fe4d662c45de8281984a2989576b991ffd5003303c24752df
194 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.com', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Duolingo apk for android 4.2.2', suggesting a lure for users seeking this software. The PDF also hosts a large number of links to other PDFs on Shopify, likely as part of an SEO spam campaign to improve search engine ranking for the malicious link. The ML classifier 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=duolingo+apk+for+android+4.+2.+2 In PDF document text
    • http://files.preciousinvestltd.com/uploads/1/3/1/4/131437018/e860e5206d3e28b.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/1/0434/5479/1846/files/51089125395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/72887396362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/vipiwaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/80354684494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/juvawufis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/8916336556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5994/4353/files/48140294457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/king_of_paper_chasin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/jurnal_biosistematika_tumbuhan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/ditirazunowukem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/9974965756.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

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_off000089ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AB 5344 bytes
SHA-256: 72e81284209ecfb63b5874f3cfc46da9b83fa4493c518945033f17a2efe55144
font_01_sfnt_off00009bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFA 10924 bytes
SHA-256: b225312f1bc69e3dd59daa4e53f9cf65d1f55f2b645902409a30805699336da2
font_02_sfnt_off0000c182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC182 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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