Malicious PDF — malware analysis report

Static analysis result for SHA-256 9293c2fc2f661b34…

MALICIOUS

PDF

52.2 KB Created: 2020-10-17 02:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f3c86f8df586281078a8fc9634ef79b7 SHA-1: 1bd52d4c40650ec02e1729fa745d19d299465e67 SHA-256: 9293c2fc2f661b345e4231c9869fff1461a4c806d7bd7f3eea38886d8424578d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=regla+de+oro+en+enfermeria+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL, suggesting a lure to a malicious site. The presence of numerous other PDF links, many pointing to benign content hosting sites, indicates a potential link farm or SEO manipulation tactic to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=regla+de+oro+en+enfermeria+pdf In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/9276785.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/f13ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bd1c0b4c-4bc2-4ce1-9b0a-2b9b3c5d19d6/55548173119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730bb8bd-cad3-4461-b339-39c793213ce0/4245932931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af99ecf-e439-4c77-917c-25c7699896d9/58368640193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f89610-9b49-4e3d-9204-50478a8c4cc1/19898677872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8451/9834/files/perpetual_help_novena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4689/3730/files/wyoming_real_estate_commission_rules_and_regulations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6904/9498/files/am_only_one_call_away_lyrics_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8023/5191/files/zacharias_tanee_fomum_gratuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7051/3846/files/mutodexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/9767260244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3826/8318/files/89064033173.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2106/5121/files/baker_steam_engine_valve_gear.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6978/7300/files/finn_x_huntress_wizard_deviantart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9400/3878/files/53612597494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/clay_county_ky_population.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/guwodifixuximarirutor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/89309986033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/anandamela_pujabarshiki_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3444/2908/files/nixibuwuziwetijujenatu.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_off00007bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDF 4896 bytes
SHA-256: bbd8d4b05487a7abb622c7638feaae6fa649d291e76318c7882dec7177d518f4
font_01_sfnt_off00008c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C65 12196 bytes
SHA-256: 6575928eaf973b097a091d6bda622e79ab08ca43a8e4ef29ac3703c9c5b53e6b
font_02_sfnt_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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