Malicious PDF — malware analysis report

Static analysis result for SHA-256 b235b58ab070cc0b…

MALICIOUS

PDF

45.9 KB Created: 2020-10-30 00:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 965060e842968e2abd38e2a25bc865c3 SHA-1: 3162c7a70d589c426b426ba736ccd02a7b666115 SHA-256: b235b58ab070cc0b38d5679404e12d5e11815f7611602756119341e07551e058
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests a phishing attempt to lure users to a malicious site, likely for further exploitation or credential harvesting.

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://cctraff.ru/123?keyword=gimp+draw+circle+mac In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f964bbed6e38.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/ridajiw.pdfIn PDF document text
    • https://tirawinuzupufe.weebly.com/uploads/1/3/4/4/134445233/3253665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/king_of_weighted_calisthenics_program.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/xexujozup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5836d7-6863-4231-97d1-10eb36f99af3/holy_spirit_lyrics_barak.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/28127065416.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/cch_lm_file_l_g.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7313/2475/files/93447309899.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/ff14_castrum_fluminis_normal_guide_fr.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

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_off0000610b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610B 5164 bytes
SHA-256: 06d8e792a4ec26cacd810722f46c3b916c3f1cbd3d4124d274e0341c1b510d8c
font_01_sfnt_off0000729d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x729D 10448 bytes
SHA-256: 43aba2298f5e92eb6b1c88c145607bedf18196633b91b943301e4098cc8225a8
font_02_sfnt_off0000965e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x965E 16104 bytes
SHA-256: f0898dad4ca575ee7ec65d37881b711376a04131121ff607c532cb07eb4dc320

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