Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7a928ab90d71eb…

MALICIOUS

PDF

47.9 KB Created: 2020-09-30 10:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aba4266caa9964fd33cc7357565fb4b8 SHA-1: 120bedbf5ab2bcc2928b86331cda1d2ca806ae1c SHA-256: ff7a928ab90d71eb9de05baed694c84e7978a3c6851e10976aacf821ec744c8e
162 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for 'Bodmas related questions pdf'. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm SEO tactic to obscure the primary malicious redirector. No scripts were extracted, but the PDF structure and heuristics strongly indicate a phishing or redirection attempt.

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.
  • 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://cctraff.ru/strik?keyword=bodmas+related+questions+pdf In PDF document text
    • http://files.deshlerchamber.org/uploads/1/3/1/4/131438641/zedetuzikobapiwaxo.pdfIn PDF document text
    • http://bakuzeji.seacretspa-amsterdam.com/uploads/1/3/1/3/131381167/f6b6376.pdfIn PDF document text
    • http://files.artistsnorthfork.info/uploads/1/3/1/3/131380263/6827460.pdfIn PDF document text
    • http://files.astanainterior.com/uploads/1/3/1/4/131437041/vexakoroviger_vidirazugagu_goxowobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/0237/0709/files/8046285213.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/leekooluu_backup_camera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/0271/8376/files/11197074628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/amperestunden_berechnen_formel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4101/2377/files/1-_99_smithing_guide_osrs_ironman.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4682/0245/files/garukopewitezegofifilelus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/2164973979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5038/6079/files/67794376849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf76d9b1-ac82-4eb2-9409-13254741f949/72130479006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf096c85-5ab7-44d6-afeb-72353697f978/degetefovizovada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc16783f-c69a-464b-bf9d-249663f83474/31669514806.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F5 5360 bytes
SHA-256: 42d85ed14d21d7c0102c66f83987a0382dc77de98c0bc23fe09dd38599e0414b
font_01_sfnt_off00007914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 14612 bytes
SHA-256: 7fc4608bf7940279b0a559ea47ae89b9742e7a561b3176ca3269c113c63374f7
font_02_sfnt_off0000a732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA732 2832 bytes
SHA-256: a12908a88df35a7e9eb57470e9a94a806bb52df392ce88a62d07cba2b79b9044

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