Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36f2022fe20f5f4…

MALICIOUS

PDF

32.7 KB Created: 2020-11-03 23:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7bca57e90c58f50465b53482588fce10 SHA-1: 3fbd10e0b550101488adc2397733b3e30e6d5ba0 SHA-256: b36f2022fe20f5f4e0b73cb78cdb57e1a6ec7cb64fe5a3b7fe663e7393d14706
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 identified as a known malicious redirector and another pointing to a URL associated with brand-impersonation credential phishing. The document body, though partially corrupted, contains text related to photosynthesis and references a URL that is also present in the IOCs. The presence of numerous external PDF links suggests a link farm or a method to distribute malicious content.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mikezexevi.weebly.com/uploads/1/3/4/5/134528008/3401859.pdf.
  • 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.link/123?keyword=inputs+and+outputs+of+photosynthesis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f9cc1ab6b680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_5f9e51de43eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_5f9792d8413ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5f8bad6dbb781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f871389c7aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f93b2895aafd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_5f99d9ac9ff49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f890dc9941eb.pdfIn PDF document text
    • https://mikezexevi.weebly.com/uploads/1/3/4/5/134528008/3401859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f8c9a30e83e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8853bd7488b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8767ee12854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_5f9e7df1d1490.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000440c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x440C 5040 bytes
SHA-256: 8a1a4fd8f02b74964e066e9b77734abb569c3aadaa9f98f43bcca83400e9fafe
font_01_sfnt_off00005540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5540 9664 bytes
SHA-256: 486a6534994acff8ff10197827419f06c0ff6de2de2f8bb4d5d9b90d33e7d2cf

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