Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f893b94e98583e…

MALICIOUS

PDF

38.3 KB Created: 2020-08-13 20:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 51daefb896bb69283cdae69fce047cef SHA-1: a6f0878c4e396e74e5bbc8948ad5dc48f830524c SHA-256: c0f893b94e98583e98fe5d187521800af3248f0afe9f017549de484d865c60d4
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms or redirectors. The primary malicious link identified is https://ttraff.ru/wb?keyword=gerunds%20as%20objects%20exercises%20pdf, which is flagged as a malicious redirector. The document body text, though heavily obfuscated, contains references to 'gerunds as objects exercises pdf', suggesting a lure to disguise the malicious intent. The file's structure and numerous links indicate a campaign to drive traffic to potentially harmful 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/wb?keyword=gerunds%20as%20objects%20exercises%20pdf In PDF document text
    • http://badumex.terminalcitytraining.com/uploads/1/3/1/3/131380999/lexote.pdfIn PDF document text
    • http://files.lcmupc.com/uploads/1/3/1/0/131070294/8580335.pdfIn PDF document text
    • http://files.sueannecelebrant.com/uploads/1/3/1/4/131437351/26ff42c.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/1/0430/0403/5221/files/32601755625.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7410/0127/files/xomizuvaden.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6935/5670/files/kanye_west_good_life_mp3_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2919/9005/files/19323988687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/adding_text_to_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/sensory_evaluation_of_food_principles_and_practices.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1171/6766/files/tezopizozubukawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/87664135752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/73256670800.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/11916651594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/gakatokiferopepodereji.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_off000054b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54B2 5432 bytes
SHA-256: ac1f94d57f672379632301782a41022df76a5a355c6bc8bc951d940f5c78c423
font_01_sfnt_off0000674b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674B 10488 bytes
SHA-256: c7db04c1c98534a8364745d126641e5674a7336a1c0e1f89d2c77f1c355c5e0e

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