Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a148cd92432030d…

MALICIOUS

PDF

37.5 KB Created: 2020-10-14 20:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e8cb80bb61691d153736b28639cb91a SHA-1: 3dca629dc7086d2010fff1538e0d48655887e778 SHA-256: 4a148cd92432030d21b75e5498b28ff268b90abfcfe096d956c58f26e4020e16
162 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, a common tactic for SEO link farms and potentially distributing malicious content. One of the embedded URLs, 'https://cctraff.ru/123?keyword=dot+urine+specimen+collection+guidelines+2020', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a 'download button' lure further supports a phishing or redirection attack.

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/123?keyword=dot+urine+specimen+collection+guidelines+2020 In PDF document text
    • https://site-1041378.mozfiles.com/files/1041378/96933850228.pdfIn PDF document text
    • https://site-1037114.mozfiles.com/files/1037114/29641184099.pdfIn PDF document text
    • https://site-1040386.mozfiles.com/files/1040386/werujozuxorazobuw.pdfIn PDF document text
    • https://site-1042011.mozfiles.com/files/1042011/14184022585.pdfIn PDF document text
    • https://site-1038890.mozfiles.com/files/1038890/7087148775.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/18ad995.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/a4eeddb.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/zebitajoze_lamadamu.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • https://site-1041289.mozfiles.com/files/1041289/77578064212.pdfIn PDF document text
    • https://site-1038599.mozfiles.com/files/1038599/59965963584.pdfIn PDF document text
    • https://site-1042349.mozfiles.com/files/1042349/somamenijavixi.pdfIn PDF document text
    • https://site-1039848.mozfiles.com/files/1039848/tuvilelanuxuwige.pdfIn PDF document text
    • https://site-1042102.mozfiles.com/files/1042102/kekegirilumanurokuteg.pdfIn PDF document text
    • https://site-1043330.mozfiles.com/files/1043330/razoxiwarivewitozon.pdfIn PDF document text
    • https://site-1048529.mozfiles.com/files/1048529/73463493858.pdfIn PDF document text
    • https://site-1040003.mozfiles.com/files/1040003/99676423271.pdfIn PDF document text
    • https://site-1042625.mozfiles.com/files/1042625/puvumuna.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/1/0435/3697/3975/files/crutchfield_car_stereo_fit_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3296/1439/files/lomafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/equation_relating_boiling_point_elevation_to_solution_concentration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0317/4308/files/white_horse_village_rehab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0747/1527/files/exponent_rules_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/congruencia_significado_portugues.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/62985881671.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_off000054ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54AD 5456 bytes
SHA-256: 5f37b1752c157ae7de424af13bb9f2de84c7aaccb1fd24746b7f4fbf31353e82
font_01_sfnt_off0000672c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x672C 9700 bytes
SHA-256: 94090b48089c765d0199821f3ba3de25ff2a3286e69611f18ab52a096d5a375c