Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49f98bdcc4d934f…

MALICIOUS

PDF

71.7 KB Created: 2020-10-31 06:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1615ececd6f02a1c880ea10946cd1591 SHA-1: 984a31341cc12ca26179fd2347cc55d1b9f505e0 SHA-256: b49f98bdcc4d934f83181acc4c05e92acee142d5f0ec3c420ab050fce0c512a1
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link disguised as a product listing, aiming to trick the user into clicking it. The document body and heuristics indicate an urgency lure, suggesting a phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?keyword=louisville+slugger+prime+918+bbcor+32%252F29+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f914c9163826.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/679188a7-38e6-481b-95a6-6c17a76fb6e1/gilevetujujesej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/73699048202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659bb0e7-28df-4b03-b13b-beb3f46ff096/70851708046.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0037/0602/files/love_quotes_in_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40788ba4-73bb-444a-b57c-ca38b681baf5/pozozexadafesogerefat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b688b5f7-fea7-47d5-8755-884698683d92/mutolufapefawezuzowuzim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95987493-af6e-4938-87a2-6712bed3150f/timupapugavulez.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/10503622414.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/southern_colonies_culture_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/papowawuvunotoloxutejitaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7662/7863/files/garmin_gpsmap_64_manual_portugues.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6739/9076/files/tv_series_screenplay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5080/9506/files/lignin_valorization_emerging_approaches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cab186-3215-4107-8013-828f7b425e02/equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcc3c3a-507a-4cf6-a035-9db15bba0e4f/business_statistics_for_contemporary_decision_making.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_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 6208 bytes
SHA-256: 36b43efadab897239c0f958e62ef21bfeeaa8c37d7fec27022948b76fb77da22
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 11196 bytes
SHA-256: eaa9fa8d913eb027b82eb6e77456dc43d4b23cc9fcb1810cf807bfa2a7ad9aeb

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