Malicious PDF — malware analysis report

Static analysis result for SHA-256 88421cc8ffe7827e…

MALICIOUS

PDF

51.8 KB Created: 2020-08-20 02:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d741156cb3a4b9bbcf155aab1fb4e749 SHA-1: ed54751e8b0aec34261736b6bc4105c27eb18299 SHA-256: 88421cc8ffe7827e6ddc3bffd19c1d63238610ead5601266ac26204c1c026292
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to redirectors, suggesting a link farm for SEO manipulation or phishing. The primary redirector URL, 'https://ttraff.cc/pify?keyword=burrows+wheeler+transform+decode', is identified as malicious. The document body, though heavily obfuscated, contains this same URL, indicating its central role in the attack. The presence of multiple PDF links and a malicious redirector strongly suggests a phishing or scam attempt.

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=burrows+wheeler+transform+decode In PDF document text
    • http://files.aera100.net/uploads/1/3/0/7/130740097/37431e65.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/1/0432/3010/1668/files/zemebige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/tuzetexaxisafokak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1410/2951/files/58050032928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7937/7830/files/81765288301.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2750/4032/files/wosonepidabavifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/appraisal_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/lazunixelokudapirapapat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/49125713379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/88611290516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/fenapin.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 1

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_off00007ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECF 5236 bytes
SHA-256: 353f607bf2d090f63b5828ee95574721d71333f4cbce7f8a5695a8a51a63b77d
font_01_sfnt_off00009087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9087 10736 bytes
SHA-256: 4241ea85b440c870fe395759cbbe61726169906ac79cde7bb3020fbe9dc7e469
font_02_sfnt_off0000b460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB460 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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