Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c6779a13576ceb…

MALICIOUS

PDF

37.6 KB Created: 2020-08-26 13:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cdbf3eec0403c3bd9fe990384eb38d95 SHA-1: 44057448cf3ce4dc5e9f51c72b9e9e7b3d089a61 SHA-256: b1c6779a13576ceb5d61fce13953d3b68d2755779828bd45e309531fbee6a29b
194 Risk Score

Malware Insights

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

The PDF was flagged for containing a large number of external links, many of which point to a redirector service. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to distribute spam or lead to further malicious content, aligning with SEO spam or phishing tactics.

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.cc/pify?keyword=jeet+kune+do+lesson In PDF document text
    • http://vupaxefed.legacyministries.info/uploads/1/3/1/4/131483245/7674.pdfIn PDF document text
    • http://files.eaglehealthinsurance.com/uploads/1/3/0/9/130969818/8c5ca.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/1/0429/0481/3721/files/absceso_alveolar_agudo_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/calculate_retained_earnings_in_balance_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3300/9047/files/beauty_and_the_beast_fairy_tale_story.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/47201770834.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/90727337518.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6853/7497/files/babbu_maan_jaan_song_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/french_spanish_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5552/1687/files/mb_carsoft_7._4_multiplexer_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9183/5546/files/93867282626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/sifawobetateranurazo.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_off000058c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58C8 4568 bytes
SHA-256: a0488fc3cb6b026996a60a81f7f2795f0b1ad8d7b9bea13d7b149216a5bf0792
font_01_sfnt_off00006866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6866 9896 bytes
SHA-256: 21e9937bc19690991e017fd98c4452e3f34807f337b30f0a881ea038d809aa2c

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