Malicious PDF — malware analysis report

Static analysis result for SHA-256 628d3625375ebe8b…

MALICIOUS

PDF

36.6 KB Created: 2020-08-15 00:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 76d8fb99b58af378e0b94733602e2d46 SHA-1: 98b28cccdb8453c226fb947905abc5714ee8fdb8 SHA-256: 628d3625375ebe8baca0ab181ada20ae5d7823116110fe789ee1509dd1c22add
202 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector service, which is a common tactic for SEO poisoning and phishing lures. The document body, though heavily obfuscated, contains a URL pointing to a redirector and several other URLs that appear to be part of a link farm. This suggests the primary goal is to redirect the user to malicious content, likely for malware distribution or credential harvesting.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=hiren+boot+cd+15.+2+iso+file In PDF document text
    • http://files.bridgeandcivil.com/uploads/1/3/2/8/132815206/9934504.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/1/0430/2965/9797/files/fasabebinili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/95983619389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/jpg_to_online_converter_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/32452026855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1605/2126/files/airlines_inform_ru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/kunotesexig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/kibuxafozaxon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/incoming_call_ringtone_free_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/studies_in_pessimism_schopenhauer.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 4

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_off0000521c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x521C 5244 bytes
SHA-256: dbf4b2e5ad9cd78b65bc8b11fe958c3e6e58b8444cc413a08c3edc14c55a76e3
font_01_sfnt_off0000640d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640D 10020 bytes
SHA-256: cfa7f2199e6d478945f7472b32cd73fb175c5a8aa39530160478c855c0171ab6

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