Malicious PDF — malware analysis report

Static analysis result for SHA-256 166c57312b0ea7eb…

MALICIOUS

PDF

42.4 KB Created: 2020-11-02 23:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f08481599afcb964142f46ce17a7f6ef SHA-1: 24db77c5d2360c995213a58a18b74cb52a8522ef SHA-256: 166c57312b0ea7ebacc1375ccf818ad714aa7f53a09529c31d174f4b70449f28
214 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 pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm designed to redirect users, and it also includes a lure for password-protected archives. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=demonstrator+login+stampin+up In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sidobojugonuxexoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f8b06a558237.pdfIn PDF document text
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/lusojaverotemukowo.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/1ab9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f943e3654d6c.pdfIn PDF document text
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/2274866.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/a08c9592-c947-4a18-9cbc-bcc14796c072/tonaxagaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa424d0b-6c46-4b5a-8755-35508c797f40/ritarolewut.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/waxiduwunusex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd0cfd0-ced6-4f32-b7ff-bf62fe0aa837/26341907046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18beb04a-0704-457f-8487-fe382341ed7d/jojuzixerobutarize.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_off00006467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6467 5136 bytes
SHA-256: d3fdd287a509ba8e7c425bfe2ebcbb0f9dad33d401957c1c0c9a6db66e07f6d0
font_01_sfnt_off000075cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75CC 12352 bytes
SHA-256: 3336ef043d5d20a106f23a476971749da8314cb03e64be09bc97e6926cf84b53

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