Malicious PDF — malware analysis report

Static analysis result for SHA-256 25058d4ef395ee2b…

MALICIOUS

PDF

132.8 KB Created: 2020-10-30 06:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d8ba1c4ee30ce073e50ef62cfa48d20 SHA-1: efaaf5fa860e43461cf202b61bfd315d416ba0ec SHA-256: 25058d4ef395ee2b185bd64ca88b8f6e54d42043c6be319ae24ff8e260df31f6
162 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 PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign PDFs hosted on cloud storage. The presence of a 'download button' lure further supports a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=lucas+speed+wax+sds In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paropabaru/unm_spring_break_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6993/1172/files/lakabebigujawexizax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3029/4940/files/amazing_grace_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6079/7333/files/dead_by_daylight_the_shape_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/4956/3310/files/fazotaxuxivewemafemubiker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f80b9e-1442-49b3-97a4-81c3b1c151ea/34960170775.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/19263756110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4366/7143/files/acestream_engine_apk_cracked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1274/9469/files/83963237940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8f3838-c838-40c9-9e94-be60826edb31/43826334067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7312/4505/files/72206963246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9625/1802/files/targeted_temperature_management_guidelines_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303d2f66-2136-4b7a-bc5b-78d60419694f/37514320316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2463/6823/files/givijudutes.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_off0001cc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC66 5040 bytes
SHA-256: 29cd26beee46d55ceda0737168b7b8a04ce8a40df673beec20a56e4b62e0a2d1
font_01_sfnt_off0001ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDB9 12240 bytes
SHA-256: 1ec5db3fc4e399625531e9331fe91f741440cb98932a31ec8b992219eb91247a

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