Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc6bf424ba35427…

MALICIOUS

PDF

50.9 KB Created: 2020-08-09 06:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a7dff4525fef87af9d2da8054e230b73 SHA-1: c3a127d7c9fa4bbce3bb0ddabe6bd8baf4c25be8 SHA-256: dcc6bf424ba354276e289d7adb69b9e378c7b6c0abf943b0970fcafdaac552a5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with the primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'effective academic writing 2 book pdf' and the malicious URL, suggesting a lure to download a fake book. The ML classifier strongly supports the malicious verdict.

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=effective+academic+writing+2+book+pdf In PDF document text
    • http://files.alisondratpiano.com/uploads/1/3/0/7/130739519/6748114.pdfIn PDF document text
    • http://files.bedfordwoolnh.com/uploads/1/3/2/3/132302970/6879419.pdfIn PDF document text
    • http://xefibafop.somonaukwrestlersclub.com/uploads/1/3/0/8/130873995/doruwam-dulagaj-parazunofo-kutuniture.pdfIn PDF document text
    • http://files.blackhillsponderosaplace.com/uploads/1/3/0/8/130874612/jafotelalakolozagad.pdfIn PDF document text
    • http://javufized.uschessschool.com/uploads/1/3/2/8/132814930/2520695.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/1/0431/7236/4437/files/rumaviwupeziwenugamibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2935/4906/files/massey_ferguson_gc2300.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/git_copy_branch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/tusiwemafuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/automated_driving_system_toolbox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/61579365906.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/aprender_a_leer_y_escribir_adultos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/sealed_portion_book_of_mormon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3583/6068/files/3267970441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8172/8151/files/47740480503.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 3

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_off00007b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B36 5496 bytes
SHA-256: 83a98b18409194d022141021ef8917a01b957d5467fb17565007ea0efa4f1989
font_01_sfnt_off00008de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE6 9980 bytes
SHA-256: d283322fe4fb2c6973fec26c192044a5cd77d13ae85742c9f10d68e192a5f9c0
font_02_sfnt_off0000affb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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