Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b18fef4bb119ae…

MALICIOUS

PDF

52.9 KB Created: 2020-11-06 02:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 085e68999698c67895ef49def7c643f0 SHA-1: e0a2ffeb9c7a0f04883ecac89e1f453e3f5871d3 SHA-256: 11b18fef4bb119ae7b9e77977007640ef93ba3754527f92e750c4dd88f136a7f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to a malicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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://traffine.ru/123?keyword=unlocked+razer+2 In PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/8cd8e6c300ec45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f8f8a9133a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f9516571a143.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/4448fb95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5f9b77677f205.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/071c699e-1208-4e25-8984-5d2521648ac0/lepomaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865b6ae3-6b99-49ed-a614-90d00d4712b2/cursive_capital_t_calligraphy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6011de18-406c-4b2a-bca0-04e6b18e207f/12431906320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13dd0f23-42fc-4111-acd2-36161fe741a2/60517907870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d13008-5639-4b2a-9ac4-a6c559f750cb/53819999271.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/abc_tracing_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8761/8982/files/vijuvepufovut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a83638-8284-4b77-8c0b-06372aa01579/22584935208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb3d1ac-581c-415d-b5e0-8c06356e4b3a/ccna_test_changes_2020.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D15 4992 bytes
SHA-256: 226d91e3cd28b30ea38e7adcbfb1787bd90f00fd6c9686a25c0acb0002ef0625
font_01_sfnt_off00009e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E26 11604 bytes
SHA-256: 47330e7cc8dadd5921519cb9959c378e8c2c21c137d6d40a8578ff76caf44aa3

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