Malicious PDF — malware analysis report

Static analysis result for SHA-256 40aa897d53c44c8a…

MALICIOUS

PDF

45.9 KB Created: 2020-08-14 15:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c3b76977d25bb8fac71ef31832bd115c SHA-1: 220af0368dfa17a59f96a00b8abb97d85e4705fa SHA-256: 40aa897d53c44c8ab2d664ecbaf14f92e05c1aa949c37d35f0e4097827c8b8de
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://ttraff.ru/pify?keyword=free+certificate+of+appreciation+template+word+doc In PDF document text
    • http://files.605mod.com/uploads/1/3/1/6/131636984/veforadonej_lijirukunowevoz.pdfIn PDF document text
    • http://zawol.bayareafotowagen.com/uploads/1/3/0/7/130776457/6091332.pdfIn PDF document text
    • http://files.mjshslionbackers.com/uploads/1/3/1/4/131438641/7297559.pdfIn PDF document text
    • http://files.franciscosaezsoto.com/uploads/1/3/0/7/130740561/3815134.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/1/0451/5568/0410/files/rate_analysis_for_brick_masonry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/zarozunos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/wogege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3564/0476/files/jisititudi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/22767056118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2729/8461/files/behavioral_chain_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/29951643342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/vojutejerifofomutamola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/33885005068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/9699819530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/27421872130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/legazuvos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2904/4127/files/practical_mathematical_optimization.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/chateau_montelena_chardonnay_tech_sheet.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_off00007562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7562 5168 bytes
SHA-256: 9973c96b9b2a1051eef4927f8e07abccb5219686d861f7f8058c5ba16487e0dd
font_01_sfnt_off000086ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86EC 10204 bytes
SHA-256: 0b2ba780974c52b6d13ad4174d2da10b02486bed98bca4f0544691ee8b8d4467

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