Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3cdc13d0db8e50…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 05:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b9059623964a74ff494dcd1c5f801c57 SHA-1: 5c36b809a8d1a780a9951d589db39699eeed797f SHA-256: ae3cdc13d0db8e50c737a7277d84cb821043cff275821f760d232e47266396e3
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 chemistry worksheet, aiming to trick users into clicking it. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the ML_NYX_PDF_MALICIOUS score indicates a high probability of malicious intent. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs.

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=honors+chemistry+unit+conversions+worksheet In PDF document text
    • http://gifake.dceoralhistoryproject.org/uploads/1/3/0/7/130739845/98ab0ce00eeb.pdfIn PDF document text
    • http://files.westfieldbouncehouserentals.com/uploads/1/3/1/3/131384789/4605166.pdfIn PDF document text
    • http://files.friendsofsapl.org/uploads/1/3/1/4/131437147/5303602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4794/3330/files/33746411162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8419/9574/files/saxon_algebra_2_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0456/4808/5159/files/lowaxelawiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/rewozumepasevovubezosogux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/nazagumatalanofevaguri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/komovumavafalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/piwataku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/wipubixejaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/11470697731.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/66082813492.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/biology_notes_for_class_9_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/ccna_textbook_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF7 4960 bytes
SHA-256: 7bc92e048feda49e08103411185eb929e9e1231cb50e44624a658072e7418932
font_01_sfnt_off00005bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB8 12044 bytes
SHA-256: e5cc86ebbc07cd50870be25428f5103ec95ea7f00dec93b948b240554bda151c
font_02_sfnt_off000081d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D8 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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