Malicious PDF — malware analysis report

Static analysis result for SHA-256 0001a8b37e60da17…

MALICIOUS

PDF

42.6 KB Created: 2020-08-01 14:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 191ff2dc39aa2bda47d855fa892d27a3 SHA-1: 141681216d254b0251271a46cf3d349e101bf0b1 SHA-256: 0001a8b37e60da17f62fc283c8649b6d1aa5b74da4fd996675f8409df66904f4
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a primary redirector URL pointing to a known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'clep biology study guide pdf', indicating a lure to encourage clicks. The presence of a link farm and a redirector strongly suggests this PDF is designed to lead users to malicious content or phishing sites.

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=clep+biology+study+guide+pdf In PDF document text
    • http://files.seandunlopdesign.com/uploads/1/3/1/1/131164067/1d5e803.pdfIn PDF document text
    • http://files.yosemitewawonacharter.org/uploads/1/3/2/6/132695714/fakatavum.pdfIn PDF document text
    • http://files.concealedcurrencyentertainment.com/uploads/1/3/0/8/130813988/renudinedadal.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000068e6.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000068e6.bin)
    • https://cdn.shopify.com/s/files/1/0432/7741/8656/files/1748611182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/99453251884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/xuwoko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2002/4989/files/xowowodizorijagerezufot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0210/0886/files/19287937162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3595/9202/files/1580229853.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0200/2584/files/4180383307.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/suzuzowibiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/detugezezadusededude.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 extracted file (font_00_sfnt_off000068e6.bin)

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_off000068e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E6 5048 bytes
SHA-256: 439c81218f78f7e91146fc42bd1a2a19ac1479f6a6f01a006be2cf1b799e75a5
font_01_sfnt_off00007a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2D 10552 bytes
SHA-256: 4f4e175f70a80c6b34f615d78bf6f41ba4b351f3f16ca58aed70b22e1277b6a3

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