Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b494a3c8317df6b…

MALICIOUS

PDF

42.2 KB Created: 2020-07-12 01:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 028ced1cd7388729cdcb984deb86ea47 SHA-1: 33b0bfa14494332d7cf797cb3e00873df2f3761e SHA-256: 0b494a3c8317df6bfba35ae174a5209fad5959102305110c6979bc8ddbb819f1
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure and a link farm designed to host malicious content. The primary redirector URL is https://ttraff.ru/wb?keyword=robert%20w.%20boyd%20nonlinear%20optics%20pdf, which is flagged as malicious. The ML classifier also strongly indicated maliciousness.

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=robert%20w.%20boyd%20nonlinear%20optics%20pdf In PDF document text
    • http://files.nymip.org/uploads/1/3/1/4/131437889/fegipidodugu.pdfIn PDF document text
    • http://files.educationmosaic.com/uploads/1/3/1/6/131636678/6979851.pdfIn PDF document text
    • http://files.neetje.nl/uploads/1/3/1/4/131406303/najibudopusat.pdfIn PDF document text
    • http://files.lilyguillen.com/uploads/1/3/2/6/132682093/foxurasumakowuj.pdfIn PDF document text
    • http://files.workinnvision.com/uploads/1/3/1/3/131384018/zudemesenodevakani.pdfIn PDF document text
    • http://files.warrenmottboosters.com/uploads/1/3/1/8/131856308/9754813.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dokubonese.files.wordpress.com/2020/06/45922182798.pdfIn PDF document text
    • https://dujexovumor.files.wordpress.com/2020/07/mekusap.pdfIn PDF document text
    • https://suwasixutalo.files.wordpress.com/2020/07/xozagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xidegafizupewutuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/1275695613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86526592296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/fejako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97285982277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/27405826645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/41280343379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/96203662281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/71662792765.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_off00006811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 5312 bytes
SHA-256: 1a26fda038f0e5b1b1a7bd784834ebd98011c0d44bfb7691c57d7be937fbca60
font_01_sfnt_off00007a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3A 9784 bytes
SHA-256: 009b0408b4756ccea5dd4a2f769684dd297d92c6e56e73a96ae00c5d6241346d

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