Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fb0daf58b4c80e…

MALICIOUS

PDF

53.6 KB Created: 2020-08-23 10:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b28d25708109897fbfc622fb6e82826d SHA-1: 70c8cdfb93fd2975a23f906a36c90dbe5ec1f31f SHA-256: 23fb0daf58b4c80e9e5c4b753c1968545ef395d360b3f62a9ada2a9b4b4f3e51
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=excel+indirect+reference+another+worksheet'. This indicates the document's primary purpose is to redirect users to potentially harmful sites. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also 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=excel+indirect+reference+another+worksheet In PDF document text
    • http://files.pawneeil.net/uploads/1/3/1/4/131406650/582d8a336ff5.pdfIn PDF document text
    • http://files.conquergoodcreative.com/uploads/1/3/0/7/130775997/3134228.pdfIn PDF document text
    • http://files.desmidtbuilders.com/uploads/1/3/0/7/130739330/3274354.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/1/0432/3049/4878/files/jedijuwetetiwuzasakovim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/38888173352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/85982643478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/kupunitugopunufila.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/61309980201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/12816351587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2468/5976/files/vampire_weekend_full_album.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3663/1452/files/kipabiwava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1474/0375/files/10694617403.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
🗂 Part of campaign: desmidtbuilders.com 8 samples

Related samples 8

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_off000085eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EB 5076 bytes
SHA-256: 50079494b83dd175250f4b927a5f2f13ef6d5ed1b263eecaeca839d4aa119e43
font_01_sfnt_off0000972c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x972C 10544 bytes
SHA-256: a8f9af2db098a9e99beb5936c2a52b07c03bdcafc3d0ad8967850c5eae8776a4
font_02_sfnt_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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