Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e2332a211a0a8…

MALICIOUS

PDF

45.8 KB Created: 2020-10-31 14:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8545b7c7f39b8cee0343037a4afdf4fe SHA-1: 9ce6ec43e678c6421ecb0d0d0ccb506f2080d03c SHA-256: 4a1e2332a211a0a8745bce2c518d4ea978decc36105993bfba681c30ec7ebcd1
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://gettraff.ru/123?keyword=logistic+regression+calculator+excel'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs designed to redirect the user, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=logistic+regression+calculator+excel In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5f8eb278328e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f91c69bdb661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f87e2ee42a05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/jujib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbf0b9f-1a43-40fb-95b9-9f5846c1e59e/16779222478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf1f497-4cf7-4829-b975-17364a02a866/55357762833.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/70089278733.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/92568152583.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2215/5415/files/bhartiya_itihas_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6901/2643/files/97151168428.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/88593605262.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/spelling_bee_grade_8_word_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/band_structure_of_semiconductors.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/new_catholic_encyclopedia_vol_7.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCE 4976 bytes
SHA-256: 2bd61708bc833fc84e995e94396931455412be7e17f2182fe2299f1855d83843
font_01_sfnt_off00006ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED7 10840 bytes
SHA-256: 3a993e9588f46e8ca9f9e3d59c6770772a148e4d461e0227bb74009b336bbfe1
font_02_sfnt_off000093ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93EC 16400 bytes
SHA-256: 44f9fd5195cf255265141daa3116ced55768786d3392a002edcbd73ee4379139

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