Malicious PDF — malware analysis report

Static analysis result for SHA-256 757f5a572a3f1b67…

MALICIOUS

PDF

43.0 KB Created: 2020-11-03 21:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: c6e6d24f0f9521700ea0f5e82d72b180 SHA-1: 92f36926c686d56929e727a23794f4ba0bfa971b SHA-256: 757f5a572a3f1b677ab03e7dd16956b69893d79715d78c369bfd037e08f545e9
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?keyword=madea+farewell+play+tour+2020 In PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/2871743.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/1380a885e8f.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/a4edec3441a701c.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/lebupiduwi-vivifagisefiveb-bivuzewa-tekab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_5f9cb879f09d1.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/698832d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5f8afbc03ce7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005c05.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005c05.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00009154.bin)
    • https://s3.amazonaws.com/napisakaluja/mamifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/understanding_business_10th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/25649304689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/47970537294.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/pamujokobumibuteb.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/vuzopigabunexa.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/nifinizififojisonav.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 extracted file (font_00_sfnt_off00005c05.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C05 5056 bytes
SHA-256: abbc2011fca8e1f0d424725c12d90bf2e6b8bf29a9928186f173311758650ad8
font_01_sfnt_off00006d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D66 10476 bytes
SHA-256: 7ff3b4c50fc0590f2a63854da35ef6e511467ab545008a6d269bcfd8dce8ee92
font_02_sfnt_off00009154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9154 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176