Malicious PDF — malware analysis report

Static analysis result for SHA-256 301b720a2580052c…

MALICIOUS

PDF

41.9 KB Created: 2020-11-06 09:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e99209547c74828eaf675b6c4ff72beb SHA-1: 3770f7cf67feaabec9eaf2f54b4f9c7efab2db77 SHA-256: 301b720a2580052ca1ed1351b331cc48b4f5f640638860aeffd20732b4abe51c
154 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 URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that likely serve as lures to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/aws?keyword=writing+clearly+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_5fa1e69a71e6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5f901ec26e2c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5f99e51345390.pdfIn PDF document text
    • https://pixogapowirotuj.weebly.com/uploads/1/3/4/6/134641161/1039874.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/dolonawunesi.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/1d82739f20a.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/4939083.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wozibap/17038059524.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/ximitulesokuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/junise.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000587f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x587F 4940 bytes
SHA-256: 442a1fb6aa6437647fbbcda22de1eda84ddf6ea493d91a4c337c904fbf0b7fcf
font_01_sfnt_off00006963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6963 10424 bytes
SHA-256: 933e54cddfccc95b2d1b9ab8c64f79271b529a1165aa59bcfc721519286471e2
font_02_sfnt_off00008d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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