Malicious PDF — malware analysis report

Static analysis result for SHA-256 7961bb839da7c8d5…

MALICIOUS

PDF

42.5 KB Created: 2020-11-02 18:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 894eab94a48c4473ad1b1f2860b828e5 SHA-1: d4c348316f59c771ea9242faa780d8fd95421056 SHA-256: 7961bb839da7c8d57c94080c03d8d63f6f9d6fb982f9bd486a5f279226d07626
102 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://gettraff.ru/aws?keyword=a+long+way+home+pdf+download' is the primary indicator of malicious intent, likely serving as a lure for a phishing or malware download. No scripts were extracted, but the presence of a malicious link within a PDF document strongly suggests a spearphishing attachment attack vector.

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.
  • 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://gettraff.ru/aws?keyword=a+long+way+home+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f973cf68b932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5f90045dd99c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5f96c9e468025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6647/3627/files/scramble_for_africa_printable_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c68a9b-4de3-422d-a086-9d122aa2db0d/48866579666.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6791/1573/files/rarirorelesorow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/blomberg_dryer_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3068/9984/files/popuxewonabama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13d36dd-a4a3-476f-96ed-a9c2267fb1a6/46125137539.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/11225243663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301fb38a-20af-436a-8d33-ce4673c56eac/nawegogemowimoter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d459d65-fec9-4c44-a402-11d88b479558/89297738289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/custom_gridview_adapter_in_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3280/2977/files/72357260933.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_off0000650e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650E 5364 bytes
SHA-256: e864790a01511bea6e9f98121bd4705ea61f3e7867f424afa1052b248d9ab3f1
font_01_sfnt_off00007748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7748 11208 bytes
SHA-256: e5fd67469487ff366d5d3b2aaccc2a11b8a01915a344cecef035a3afc7baa333

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