Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7e5b7f9385b427…

MALICIOUS

PDF

41.0 KB Created: 2020-10-30 11:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4fb3c32a405fa572ee7d2d34d75315e2 SHA-1: 9692f0211a371437687759956995354a8a93ce6a SHA-256: 4c7e5b7f9385b4270d8dd69865c4c5faf6b39104a0555d32a9dfde1eaf8001c3
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a manual, combined with the redirector URL, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/123?keyword=milwaukee+6130-33+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f963ccfe547d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f8a33cf33d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5f8e0cc0ec478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5f8c948fcdfc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f926659a1eb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c700e1c-aeb5-414b-81e6-5d46ae6a02d5/ranulases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66db797-ff4b-4ef8-bd63-694313f1eb87/turilewofawinodazetudel.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/bubimiwugugodunutumiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5780c2-5294-4ce3-83c1-2f55af3b69a9/punezaxaxinute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcf15e3-9c84-4a1a-baa1-eabbc0864c56/41103651287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd8370b-acc0-4246-aee3-14da48547a39/maxidevevomeni.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/digeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb606b6f-37fe-456c-957c-e96bc70dee45/55286720109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823aa554-8f52-4387-8ea3-0f5e96e545e9/43595196352.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6034 5264 bytes
SHA-256: 27717fe02ab57c62fd00d299dab040ee83fce9abef63249428e43bbf9c4e390e
font_01_sfnt_off00007239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7239 10912 bytes
SHA-256: 49b4c40d87d77d4290402ede9fa8e4dbb6df4061bd684364c8766b24f684f95c

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