Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac87caa5ca997dc6…

MALICIOUS

PDF

44.0 KB Created: 2020-08-09 04:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f891e2a94a08ab9fa68f20cb4247fa35 SHA-1: 21e5c2436d39d65663c115f296b965eb04eb80ca SHA-256: ac87caa5ca997dc66c78ca2f31872f694cc4b263c2a9097202badb7341d81c46
194 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. One of these URLs, 'https://ttraff.ru/pify?keyword=engineering+economics+annuity+example+problems+with+solutions+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and embedded URLs, suggesting it's not intended for human consumption but rather for SEO manipulation or as a lure.

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.ru/pify?keyword=engineering+economics+annuity+example+problems+with+solutions+pdf In PDF document text
    • http://koxav.advancedmaterialsservices.com/uploads/1/3/1/6/131636725/6242304.pdfIn PDF document text
    • http://renejeg.fitkidtext.com/uploads/1/3/2/6/132681352/8929525.pdfIn PDF document text
    • http://votasodop.cotelab.org/uploads/1/3/1/6/131636948/pixoxaw_notega_mowutivudukata_javotufelujipuw.pdfIn PDF document text
    • http://files.jojoamo.com/uploads/1/3/1/0/131069819/dd4e7c4.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/1/0430/8631/5684/files/convert_to_word_arabic_font.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0725/8269/files/farmall_h_service_manual_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/transformador_de_alta_frecuencia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/administrao_da_produo_chiavenato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/rafoxupolixovoluxavub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/tokunarofazevoneguzelumuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3463/1579/files/mojekemibenan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0458/4355/files/safotifazixivut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/memukixibaranofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/bugijuzunadabumugepawom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/0508/6616/files/the_bible_timeline_chart.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 7

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_off00006a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 5928 bytes
SHA-256: 55844c705009e7e4b11c60eceb09a5625a2323fdbe7f007154f55222ad3ec0ee
font_01_sfnt_off00007e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E34 10992 bytes
SHA-256: 8b202a768b82b8e9497462a7493f6d151188ff89a50a079924969f8195b3a554

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