Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b2f043da895827…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 14:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a16758a9ea320ad753ec78e71300550c SHA-1: b58cb05239262ec3c85adf6adec4d59f0409bf14 SHA-256: f4b2f043da895827b79ae9a5c696ab5e1f03caafd6b659217471546c6b0bbc9d
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free worksheet, which leads to a link farm. The ML classifier strongly indicates maliciousness. The primary malicious URL is https://ttraff.cc/pify?keyword=free+multiples+worksheet+4th+grade, which is designed to redirect users to other sites. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent.

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=free+multiples+worksheet+4th+grade In PDF document text
    • http://files.acrha.org/uploads/1/3/1/3/131397964/vanovegifivo.pdfIn PDF document text
    • http://files.artbyjenniferharrington.com/uploads/1/3/1/6/131636655/kepigoranomalil.pdfIn PDF document text
    • http://files.createmoremusic.com/uploads/1/3/0/7/130776516/kikuwafonabogiwur.pdfIn PDF document text
    • http://files.acuityultrasonics.com/uploads/1/3/1/4/131407552/a2530.pdfIn PDF document text
    • http://files.geoed1.com/uploads/1/3/0/7/130739910/168275.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/1/0435/5486/5320/files/31263187907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/gilapari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/61463388916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/rugutifuvijun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1358/6600/files/zufipumiduxexuwiwiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/eu_antonin_artaud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3204/1889/files/poviroguwajatoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/xobusugabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/16665289693.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/kifabijelupamupik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/nosaruzubavokebivumuvok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/iupac_nomenclature_of_spiro_compounds.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_off0000632a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632A 5572 bytes
SHA-256: 7591ae31b91c711c8ecf3b6443413cdd12885ae860a294a5e9fe3188672b2f16
font_01_sfnt_off00007611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7611 10368 bytes
SHA-256: 47553df048ee865df7bf5860499d3e98b75e96aef876557e1f0f33283ccd6480

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