Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd87328aef8a5a19…

MALICIOUS

PDF

37.0 KB Created: 2020-10-31 08:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 5437814423805cdae97c37ac1f1697a7 SHA-1: 9b59a0e3874a598f3d0d4e22ca69881d3fb1af28 SHA-256: cd87328aef8a5a190e21f48287ec25662f697e68961920c61a069ff8d39a9085
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/123?keyword=7th+inning+smash'. This URL is also identified as an SEO redirector, suggesting a phishing or malware distribution lure. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the presence of the malicious URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/123?keyword=7th+inning+smash In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_5f94966f46ba4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5f9270b244441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f8d984452bcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aecb93c-d933-47c2-bbf5-96e887d0f09c/federico_nietzsche_biografia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5283/8297/files/5364193047.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1388/0483/files/substance_abuse__recovery_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4571/4077/files/world_cup_2020_schedule_ist.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/76046350669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6455/6710/files/ark_rotate_object_xbox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3866/1527/files/candy_colored_clown_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8fbb49a-9a62-40b7-895b-10d1c4a46853/jesemomozofiduwejotidug.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/24956668634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7174/9309/files/wpa_wps_tester_apk_for_jio_phone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4254/9145/files/22965938159.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5316 4956 bytes
SHA-256: 874a9961b2100b391089fb0cb4e8600287606283f8752e4c98080a5659e10e0c
font_01_sfnt_off000063d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D5 10680 bytes
SHA-256: 65562ce35dc672be664fb58d1730c875f49c3de5d23028de84f42a4a3613186e

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