Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa1738117e9e272…

MALICIOUS

PDF

45.8 KB Created: 2020-08-11 20:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d33a040190f7f15865e2cb041bce9c68 SHA-1: b57359ed968a7b01a1dae77297d5f1f8dd442332 SHA-256: 8aa1738117e9e272df181e494002290d8d8023465f61fb7aaabb450a86006bde
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=mht+cet+2020+biology+syllabus+pdf+download In PDF document text
    • http://kelezemor.jasperskiteam.org/uploads/1/3/2/3/132303195/jevefebapivorugo.pdfIn PDF document text
    • http://files.magickc.org/uploads/1/3/1/4/131455543/1d7e01a2fb7e.pdfIn PDF document text
    • http://zupij.jakecastrosoccer.com/uploads/1/3/0/8/130814328/vozamozixukusoso.pdfIn PDF document text
    • http://files.selindoalpha.com/uploads/1/3/1/3/131379567/nubewarer-lubutatalolape.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/1/0430/7596/0985/files/wilotozekiramutavetagefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/simon_schama_landscape_and_memory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/bucket_elevator_design_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/nesiwifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/britax_b_agile_stroller_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/31493108238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonamov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7891/0106/files/bedevuxana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7312/7079/files/zukekuw.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_off00007136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 5936 bytes
SHA-256: 11b39cb01b35dcf635e877cefdfef8da74287f3320e47d4a53078b5f3911784b
font_01_sfnt_off00008582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8582 10980 bytes
SHA-256: c4c4aea64ac08cf03873830bda2b70e5d05109b8d612ce2b69d5e425d040b1f4