Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca260b346d906fe9…

MALICIOUS

PDF

45.0 KB Created: 2020-10-09 01:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: bf1274b1936836be5398d86c6ece104c SHA-1: f1575b47251eff9765434f90a4d57205cffb3ba2 SHA-256: ca260b346d906fe9545877b314a12b3260fdef1a28383573435e888dbbc2e9c8
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.club/pify?keyword=japan+size+compared+to+us+state In PDF document text
    • http://nekoli.organizationcommunicationinschools.com/uploads/1/3/1/6/131606490/jonegudukig.pdfIn PDF document text
    • http://vakonow.doublejoutfittersny.com/uploads/1/3/1/6/131606271/2717341.pdfIn PDF document text
    • http://files.mikecounselling.com/uploads/1/3/0/8/130874570/7827745.pdfIn PDF document text
    • http://files.franciscosaezsoto.com/uploads/1/3/0/7/130740561/3815134.pdfIn PDF document text
    • http://files.portageresourceguide.com/uploads/1/3/1/6/131606644/8719065.pdfIn PDF document text
    • http://files.lbzphotography.com/uploads/1/3/0/7/130775851/marej_fufezeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8509/7877/files/xupisugirodi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7884/4068/files/edison_driving_school_edison_new_jersey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6225/9865/files/89453860091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2376/4125/files/5708884940.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/mamamezifemitosinitaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/4002/7036/files/ameda_breast_pump_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6864/0414/files/steel_wool_mice_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/powder_burn_rate_chart_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AD 5108 bytes
SHA-256: 3c9081fce930d1a24407a921a4847fc2fa43e289b699542dc0800cdcc7caf3da
font_01_sfnt_off000075e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E9 10392 bytes
SHA-256: 35c9c96c4fe1be9b8b39607031a4091a7aed5bae4b7574cf9e5e72fb0b284216
font_02_sfnt_off0000997d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x997D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f