Malicious PDF — malware analysis report

Static analysis result for SHA-256 662ee138fdd0e1bb…

MALICIOUS

PDF

62.8 KB Created: 2020-08-10 12:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b85cccd374cffa2cfa84d94f6d03f702 SHA-1: f6c0d651f165beb9e8848d76a90c1c3ba5716849 SHA-256: 662ee138fdd0e1bbb46f0104098a3cb2f905c594545e421917bea62a355b04d0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a link farm designed to appear as legitimate research papers. The primary redirector URL, 'https://ttraff.ru/pify?keyword=referat+orchitis+pdf', is explicitly flagged as malicious. The document body, though heavily obfuscated, contains this URL, suggesting it's the intended destination. The ML classifier also strongly indicated maliciousness.

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=referat+orchitis+pdf In PDF document text
    • http://files.winetruffleboutique.com/uploads/1/3/0/8/130874110/teregede.pdfIn PDF document text
    • http://files.cristinaburgueno.com/uploads/1/3/0/7/130776887/tepemumemare_bumejuvupozeku.pdfIn PDF document text
    • http://files.boulevardmarket.com/uploads/1/3/1/8/131857562/46c7aac11.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/1/0433/6055/1070/files/roblox_asset_downloader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1673/2315/files/universal_banking_system_in_nigeria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/ecriture_alphabet_francais.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/28110565458.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/pictures_on_chromecast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2889/8211/files/cherrypickers_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/marepinasuzogiranum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8930/5501/files/red_cross_saba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/62267580871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/62365104544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92313200312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6245/6483/files/manorama_online_calendar_2020.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 2

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_off0000b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 5220 bytes
SHA-256: dcb3320d03332da63189791479c7141d9557fd93754cc088fa82e01c0e823959
font_01_sfnt_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 11588 bytes
SHA-256: 56dd28dfff0ca1e6e057215065bc7f052837e42661aef3801dc77d073bec9458

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