Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb0cdf9890261f2…

MALICIOUS

PDF

48.3 KB Created: 2020-10-01 22:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: af23f883e2ce9d49c4e924da6951e1e2 SHA-1: 66a6623685f26e2b5836d29b3689eb8c19f2da28 SHA-256: 1fb0cdf9890261f25e9a4abb1180baf06f7fd5f850af56ac0f24fe3bc3593c69
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://cctraff.ru/strik?keyword=assassin%2527s+creed+3+pc+flickering In PDF document text
    • http://files.fumclg.org/uploads/1/3/1/6/131637483/xojuxosaxofenarak.pdfIn PDF document text
    • http://veropuje.oscarkoolkidz.com/uploads/1/3/0/7/130739616/mojunur.pdfIn PDF document text
    • http://dunozex.eastwindsmusic.com/uploads/1/3/1/0/131071157/dunibomimaliwos-rares.pdfIn PDF document text
    • http://gitewip.pjgilbers.com/uploads/1/3/2/8/132815176/2875206.pdfIn PDF document text
    • http://files.berkes-sanchez.com/uploads/1/3/0/7/130740231/towelo.pdfIn PDF document text
    • http://vakegide.nursevisit.org/uploads/1/3/1/4/131438188/wewuluviditudofubob.pdfIn PDF document text
    • http://kotumil.lorrainepearl.com/uploads/1/3/1/4/131452976/somipekidolazix_davokulutefexub_puzesebujote.pdfIn PDF document text
    • http://razapova.holdmetightasheville.com/uploads/1/3/0/7/130775075/9459024.pdfIn PDF document text
    • http://zazegikaj.holycrossboys.com/uploads/1/3/0/7/130775447/741bd.pdfIn PDF document text
    • http://wopivupog.christalineadrianti.com/uploads/1/3/2/3/132302912/1fc36cb118d15.pdfIn PDF document text
    • http://files.prescottstudiotour.com/uploads/1/3/2/3/132303163/1084730.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/1/0429/7054/6329/files/subitizing_worksheets_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6896/0149/files/chemistry_final_exam_review_packet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0676/6488/files/heated_seat_covers_amazon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/72240684721.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/49673137866.pdfIn PDF document text
    • https://www.youtube.com/watch?v=GWwSAYJCoGkIn 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_off00007555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7555 5576 bytes
SHA-256: c1d6d89eff8f56edf188ade2d0bced354cb0e918c4ede130f1565048ae4985f2
font_01_sfnt_off00008861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8861 13460 bytes
SHA-256: a8e7876f4e4f28cdb6772f12c4bf9ffe82f0761300c09fb6a57c11eef4ac4ad6

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