Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68a27f9f5a2309c…

MALICIOUS

PDF

70.9 KB Created: 2020-10-30 19:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d35dcdc6dd0e9a77351494fffd02eaca SHA-1: 43dc68ce53450cc84cde30bb2ef403357153e2e3 SHA-256: e68a27f9f5a2309c6caf2c74479129d5f3a4cc54a2ad24d3b43bb1a2aa74bce7
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document that contains a high number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body also contains text related to payment redirection lures and urgency, further supporting a malicious intent. While no scripts were extracted, the presence of numerous malicious links and the ML classifier's high confidence indicate a high likelihood of malicious activity.

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/123?keyword=divorce+busting+forums In PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/9074655.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/de6d0c2111.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/83ff334aab80255.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/eeb6f.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/diletosetara.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/95b9f34d-82ff-4dfc-b9ed-2c7108081f33/jipikab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e13eee-9cfe-403f-bde5-6c4ddf06ccc2/kanelasuvod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10fa075-ed5d-4098-b6bc-000daa55e48a/4015161221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae46a23c-69a2-4014-a777-7c84458ec35e/gepazulaxipuwivusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00908e9-a5e9-4c05-908c-2d0325512add/23383501602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0701/1739/files/74007760168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d926499-af6a-46f2-8713-7ae7618e0054/9010948176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f70ed4c-5c6b-480c-905d-ecd4602ce1bd/11527924737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cedc37c2-01d6-495d-b87f-c73ff31254f3/2842052622.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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 5160 bytes
SHA-256: a0e2a4ed0f85f911fcaf6e37d3ba74f38eac14fc8c9f82bb9701de0256fda9d3
font_01_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 11236 bytes
SHA-256: 0419241b462b56a7c0bed149882cd6b4bb3af1dca14c447ade8ebb830714c2a9

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