Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c45ab18cbb18040…

MALICIOUS

PDF

47.8 KB Created: 2020-07-17 20:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: d5b3a5568d1e0e63292c157d076aa775 SHA-1: 32c3a2d466893846a1dd0205ecc3ea7a8a3ff8ac SHA-256: 8c45ab18cbb18040872a6b4b5be5ea26b7bd10c527d1381d8e77373d84276950
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm designed to manipulate search engine results, directing users to a known malicious redirector. The primary lure appears to be a resume format for biotechnology freshers, which is a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the PDF structure itself contained numerous external links.

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/wb?keyword=resume%20format%20for%20biotechnology%20freshers%20pdf In PDF document text
    • http://files.tomgauthier.com/uploads/1/3/1/3/131381693/dukenebipatiw_soxagobipo_nonirawa_wedovomelig.pdfIn PDF document text
    • http://files.carpetcleanersnetwork.com/uploads/1/3/0/7/130776266/6e4fc0b678ed5b.pdfIn PDF document text
    • http://files.mariecharpentier.net/uploads/1/3/1/4/131483019/batipaxadas.pdfIn PDF document text
    • http://files.orchardstreetmusic.uk/uploads/1/3/1/6/131606533/7c00826db81557f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gexefaduxoka.files.wordpress.com/2020/06/gufukapekitewu.pdfIn PDF document text
    • https://defunudedi.files.wordpress.com/2020/07/72074231319.pdfIn PDF document text
    • https://vajowobago.files.wordpress.com/2020/07/27803408665.pdfIn PDF document text
    • https://dedokufon.files.wordpress.com/2020/07/loziwazimo.pdfIn PDF document text
    • https://mapulosuxuju.files.wordpress.com/2020/07/29879914694.pdfIn PDF document text
    • https://pejubedigif.files.wordpress.com/2020/06/17709169466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/jivuwujewekufulononobuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/karilutifegafug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/nogovipuguwidixamodatila.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/riwabomurajipaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7060/3932/files/tusibekinob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/72262458007.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAC 5700 bytes
SHA-256: 6a66650710eb8b1cc8ac946bebd245405a4052d44699119dda911d5978cfca41
font_01_sfnt_off00008df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF1 10448 bytes
SHA-256: a7a59ccb96178f1aadab55d62aa91356f2bb324dddefcfc64f601249ad889968

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