Malicious PDF — malware analysis report

Static analysis result for SHA-256 910052905ddb3669…

MALICIOUS

PDF

41.1 KB Created: 2020-11-02 16:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3bc6037c7fe827b2c616a8247e98490b SHA-1: 62692922069f779f532aafbbc9cb940798594306 SHA-256: 910052905ddb3669127ec634e0631d0854366d6f1dffb2532fbf0937083511bb
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (https://cctraff.ru/strik?keyword=credit+sales+are+recorded+as). The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to direct users to malicious infrastructure. The document body, though heavily obfuscated, contains the redirector URL, indicating its likely purpose is to facilitate malicious redirection.

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.
  • 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.
  • 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=credit+sales+are+recorded+as In PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/fasokut-fanebetezizozal-budixodevudilu-nixasam.pdfIn PDF document text
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/tijot.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/1/0429/5127/8755/files/kijasuzojazanexagaxeteweg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7136/3992/files/zunuzusipajasatemu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/fast_save_for_instagram_full_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/25324228780.pdfIn PDF document text
    • https://s3.amazonaws.com/betimugi/41148195370.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/lofunutexejepetenum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/2811/9457/files/18060259458.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/chevy_rear_brakes_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/basic_electronics_communication_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad6d012-413a-44cc-9875-90c436c8faae/dolagemuvogisadeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3082/7931/files/23976980081.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/ubqari_magazine_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/the_art_of_storytelling_john_walsh.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_off000064fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 4836 bytes
SHA-256: 3f3a003696353ef5db3fd2ea9bf4e81f7639b3c476a3f41d070e6f1c56a1b818
font_01_sfnt_off0000756f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x756F 9848 bytes
SHA-256: 9a2eb5b82421fa48c22ce8770f34312a3d689dacc75a3d1f42f46684a80d8798

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