Malicious PDF — malware analysis report

Static analysis result for SHA-256 591177a43ac61913…

MALICIOUS

PDF

49.3 KB Created: 2020-09-30 23:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cc7a75822a586d990c59c6d98f477981 SHA-1: 7e488e691dab04ff046c3778fada54ba9710af7c SHA-256: 591177a43ac61913fb3cf416e7a9308667fa8f5ef4e7874596369407e09d742b
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=balika+badhu+bimal+kar+pdf In PDF document text
    • http://bekegaj.shannonhergottart.com/uploads/1/3/0/7/130739826/ed5e48224c77.pdfIn PDF document text
    • http://xewujevev.bwvalencia.com/uploads/1/3/0/8/130874642/8ca42.pdfIn PDF document text
    • http://valoz.yc19.org/uploads/1/3/1/8/131871816/topoteforabatofu.pdfIn PDF document text
    • http://fobubeja.bigdoginstallations.com/uploads/1/3/0/7/130740117/godelik.pdfIn PDF document text
    • http://files.depressionwillfade.com/uploads/1/3/0/7/130739379/dopukasoko.pdfIn PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/3348753249.pdfIn PDF document text
    • https://site-1037821.mozfiles.com/files/1037821/pufuwirazuwunopesojebev.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/1/0431/5725/8402/files/bangladesh_population_census_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/weather_saginaw_bay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/29028496714.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1904/1954/files/dufakixulujutibefiwuxivul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0960/5541/files/fetudosopiwebez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/torujanadusubarasojulul.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000665d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665D 5356 bytes
SHA-256: 9a37fa150d6e5a32f5531bf20bc5bc2f81c1e3d276be64fe36b17bc50c9e103d
font_01_sfnt_off0000785b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 9768 bytes
SHA-256: bb556c73efc8bcccfbb3fdc2ea925a89555569e6c1ea5566e26446e253794c57
font_02_sfnt_off000095df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95DF 10076 bytes
SHA-256: 8856ad442738364e786344585db489b7988b9762ff1275ec5ff7f714014acbbc

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