Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b81c3c055aadfd…

MALICIOUS

PDF

42.3 KB Created: 2020-08-14 16:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e89fc7dd7ac223310b05a4c5f878e1d8 SHA-1: 3b7f3fc9951290fcb9e46119d7744cf9281841cd SHA-256: 49b81c3c055aadfda5909b066d1f7859541045cc73b176ebdf4f9274f6a9a820
194 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector service, which in turn points to a malicious URL. The document body, though heavily obfuscated, contains text related to 'multiplication worksheets grade 4 with answers' and the malicious URL itself. This suggests a social engineering tactic to trick users into clicking the link, likely to download further malware or lead them to a phishing page. The ML classifier strongly supports the malicious nature of this PDF.

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=multiplication+worksheets+grade+4+with+answers In PDF document text
    • http://files.suzannepetrizzi.com/uploads/1/3/0/8/130813645/safez.pdfIn PDF document text
    • http://dezobimo.cecilyculver.com/uploads/1/3/2/7/132740880/6f2ae6d.pdfIn PDF document text
    • http://files.meteorite-village-happytour.com/uploads/1/3/1/3/131380107/4838703.pdfIn PDF document text
    • http://sepazul.uusintaensemble.fi/uploads/1/3/1/6/131637254/4408498.pdfIn PDF document text
    • http://zuwene.pitsstore.com/uploads/1/3/1/4/131438096/bcef2421b1c1.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/1/0435/7344/4767/files/baperogupuvana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/eu_gmp_annex_1_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/fepilegetetawazaduto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/all_bollywood_songs_lyrics_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/1496498384.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/fubajilekolagadogeme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0826/1287/files/balusunufetanamememutulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5123/8047/files/p90_x_2_torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/jasal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0261/7252/files/char_in_java.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.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 4

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_off000066a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A8 5584 bytes
SHA-256: b58752d94d05b266af3a9c8c7ab6cd5f82134fff4efd85b0ecde8efb400231eb
font_01_sfnt_off000079bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BD 9948 bytes
SHA-256: 7c764e09909f92f1787a832e9c550de15c82efcfd9e4f3488abd94b0b1de3479

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