Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc6dde7fe0a131d…

MALICIOUS

PDF

43.3 KB Created: 2020-07-10 15:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 2ecf6b025fe5dc1759ec86e544492c4d SHA-1: a1b9eb08877051b0fa884e39c4b9a93213985329 SHA-256: fbc6dde7fe0a131d72150748d1cae85db9dc81ed982f05986942ab8e3b3cb20c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous embedded links, many of which point to external PDF files hosted on various domains. The primary link, 'https://ttraff.com/wb?keyword=vade%20mecum%20pdf%202018%20gratis', is flagged as a malicious redirector. The document body, though partially corrupted, suggests a lure for a 'Vade mecum pdf 2018 gratis' download, indicating a social engineering tactic to drive clicks to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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://ttraff.com/wb?keyword=vade%20mecum%20pdf%202018%20gratis In PDF document text
    • http://files.atlaslincoln.org/uploads/1/3/0/7/130776001/2385120.pdfIn PDF document text
    • http://files.theroute92.com/uploads/1/3/0/8/130873973/zuguxizamuri.pdfIn PDF document text
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdfIn PDF document text
    • http://files.poehaku.com/uploads/1/3/1/6/131607239/ab7f23f.pdfIn PDF document text
    • http://files.travelbycamera.com/uploads/1/3/2/6/132681767/xunizajanij-zijavekinekad-xakomifake.pdfIn PDF document text
    • http://files.cedarparkconcrete.org/uploads/1/3/1/4/131438848/wolagupiraj_danoxuwida_nubuvukim_pegud.pdfIn PDF document text
    • http://files.connoisseurstours.com/uploads/1/3/1/8/131857071/abaa266e7dc9a.pdfIn PDF document text
    • http://files.braverthanthewaves.com/uploads/1/3/1/4/131453807/5359755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zexivavazi.files.wordpress.com/2020/07/26327861909.pdfIn PDF document text
    • https://sidebuxaz.files.wordpress.com/2020/07/papoletefo.pdfIn PDF document text
    • https://xopipovezeru.files.wordpress.com/2020/07/luxaxapabizo.pdfIn PDF document text
    • https://nilufupuf287652963.files.wordpress.com/2020/07/15093581559.pdfIn PDF document text
    • https://zoradake.files.wordpress.com/2020/06/90684055191.pdfIn PDF document text
    • https://xukitivusapu.files.wordpress.com/2020/06/22615467389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipipopiluniwewikojidil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/sabuguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/93959491289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007074416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/pejiwarofa.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_off00006272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6272 5596 bytes
SHA-256: 5ff1a1238d906e9ea64ba0091b3a6fba3b8fe1bdebfced62d090356e53397647
font_01_sfnt_off00007588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 13596 bytes
SHA-256: de4cba410e071ebd49fa863efc406f133acdd99eb88b78a773629252e4b18c9c