Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec04610f95a994db…

MALICIOUS

PDF

37.3 KB Created: 2020-11-03 01:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef9b0631a45eac0c282b9748caec501b SHA-1: 98e96ecb1b9f66fb421cac63795456e1d251388c SHA-256: ec04610f95a994db288ef130321781879c2ad8436d6e0bea72cf1454a5547956
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a link farm. One of the embedded URLs, 'https://gettraff.ru/aws?keyword=serenader+on+a+pea+green+boat+crossword', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm structure strongly suggest a phishing or redirection attempt.

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://gettraff.ru/aws?keyword=serenader+on+a+pea+green+boat+crossword In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5f898af2e3471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5f9d2c94dd095.pdfIn PDF document text
    • https://rirulejirosajis.weebly.com/uploads/1/3/4/3/134320684/zipixikijegabuwig.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/kogojavajopukobo.pdfIn PDF document text
    • https://pepepijofo.weebly.com/uploads/1/3/4/4/134464576/nativodalowokuvob.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/0e56d931-2cce-4ef4-8933-beb4a51b0ce2/jagogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab669045-0038-4428-b8d7-6ab5b6d372f5/juwuzibekegopozudavijuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a843c4ad-147f-4b5c-a1f4-d3ac6f0091d6/lozije.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5660/2529/files/aku_patna_b_tech_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9738/9725/files/79509949324.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_off000052d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52D8 5544 bytes
SHA-256: 979ac3302cfa75b8de253b2fa1d5323f60f2f6c7f3f5c4046c9258e4b27fc21d
font_01_sfnt_off000065cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CB 10312 bytes
SHA-256: 9ea610c01fe5289b4080a875e6ea324cd77b581abbd9c98be1f04751ef0dfe8e

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