Malicious PDF — malware analysis report

Static analysis result for SHA-256 857783814235dee7…

MALICIOUS

PDF

43.5 KB Created: 2020-08-23 00:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1c6747c450617bbe6425a34caca6e3cd SHA-1: d621b4d5d9c164e409ca2f73ce8ebbcfbe186667 SHA-256: 857783814235dee7921337a2a5be457992b7770eae296eb61aa39acdb59df7d2
194 Risk Score

Malware Insights

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

The PDF contains a lure related to a 'casual leave letter format' and embeds multiple links. One primary link, 'https://ttraff.cc/pify?keyword=casual+leave+letter+format', is identified as a malicious redirector. The document also includes a large number of links to PDFs hosted on Shopify, many of which are likely part of a link farm designed to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=casual+leave+letter+format In PDF document text
    • http://nudebat.midvalelincolnpto.org/uploads/1/3/1/3/131381021/7563610.pdfIn PDF document text
    • http://files.stphilipandjamesnewbentley.com/uploads/1/3/1/8/131856105/7832515.pdfIn PDF document text
    • http://wegibew.virtualpowerplant.co/uploads/1/3/1/4/131408061/3eb505504f46f8.pdfIn PDF document text
    • http://denemomu.rotboxrustorations.com/uploads/1/3/2/7/132740214/6140051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/10939403190.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5199/8623/files/5260651185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/enduring_power_of_attorney_template_nz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/72214865676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/18320533087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/10425259706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3423/7345/files/muvez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/volikopawil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/sezofaxojetur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/5042/9598/files/riwafuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000607f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607F 4724 bytes
SHA-256: 46fa5ea0e70818c8a86e6a67fcb90265c46766091c045422ae489d046d4f773d
font_01_sfnt_off0000709b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 10068 bytes
SHA-256: 836c14f354dd113fab65f3daf51dd9f29d14f67cd54653bd7f7987d8b2968395
font_02_sfnt_off00009321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9321 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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