Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2143a3d18f2c56…

MALICIOUS

PDF

35.6 KB Created: 2020-08-21 22:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b973a2702c0a9310c2756d6012beae76 SHA-1: 82dd5f4509d0cac898c466628433770d96161bac SHA-256: 2a2143a3d18f2c56682d8df15fdadc2851d0d2e720422ee57a919a547e598aba
202 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=tunnelbear+vpn+apk+old+version'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The document body, though partially corrupted, contains text related to 'Tunnelbear vpn apk old version' and the authoring application 'wkhtmltopdf', suggesting a lure for software download. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=tunnelbear+vpn+apk+old+version In PDF document text
    • http://files.centralcanadiandistrict.com/uploads/1/3/1/8/131871633/2fe7c75b64f394.pdfIn PDF document text
    • http://rorupol.thecatsmeowtarotandtalismans.com/uploads/1/3/1/0/131070027/9267947.pdfIn PDF document text
    • http://files.tastytemptationsbytia.com/uploads/1/3/1/4/131438405/8eb74.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/1/0430/2720/2205/files/49626578711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/save_smaller_size_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/webemumezufusawu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/45006063799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/21463965332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6169/6925/files/traducir_ingles_espaol_archivo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/bescom_bill.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/koxixuzuxosadetimub.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_off00004d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D6A 5164 bytes
SHA-256: 60a8728a1deb340294cbff0f55a80133cfdf29850a45b54e2424d192e17beffe
font_01_sfnt_off00005f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F00 10232 bytes
SHA-256: fcaf013aa1bb3fa45dc8da12387d75e2bb93d467af859577e421756e939947f6

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