Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f7780c6cdbb9d5…

MALICIOUS

PDF

47.5 KB Created: 2020-11-01 06:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5c1c243fff47ad9ed948553910974beb SHA-1: 17305a03b3b9b5b275c59ba0fa71ef4605c175a1 SHA-256: 72f7780c6cdbb9d506741af5870a250ba4c07240dbe50139453c1dc4f4f72630
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, a significant portion of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure for downloading an 'unkilled hack apk'. The presence of a link farm and redirector suggests an attempt to obscure the final malicious destination and potentially engage in phishing or malware distribution.

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://cctraff.ru/aws?keyword=unkilled+hack+apk+2019 In PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/dd03d2.pdfIn PDF document text
    • https://vovaderinikuxu.weebly.com/uploads/1/3/4/5/134528816/3439394.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/nesaramenipap.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/56c01fc507d519.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/1019907.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/d6e3987e-1792-47a2-bdc1-1cb98ee7d823/gravitational_potential_energy_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf4dc26-0e8c-4c53-b4ed-3d1145ed34ec/26219493374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a767a7-23e3-48b4-a096-c552a0c54a02/kujaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/93386527563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974cd107-8e51-42b8-9e68-7ca1f5205fe9/joros.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/8614103900.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 8

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_off00007cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF1 5424 bytes
SHA-256: 50a84e4f5c1157be9c78098d38c3d3862dc7f69671e726a66ddb0219aa84d01d
font_01_sfnt_off00008f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F70 9952 bytes
SHA-256: acbf203eb07cccc583923df9cd479c41396843bcf6e4de9736110cf49dfce1f1

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