Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1c2d9ef20fe5e0…

MALICIOUS

PDF

37.6 KB Created: 2020-09-19 05:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a3fff40ac5841f96818bd099e314d1fa SHA-1: 0ea0409cd196f6cfb210349ff3ea9ea3eeb71879 SHA-256: 4a1c2d9ef20fe5e0802ac930fe39e54e8a83034f59434b32a50e78c42b69b653
234 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm. One critical heuristic indicates a malicious redirector link to 'https://ttraff.club/wix?keyword=non+proportional+graphs+worksheet'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links suggests a campaign to drive traffic to malicious sites, potentially for phishing or SEO poisoning.

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/wix?keyword=non+proportional+graphs+worksheet In PDF document text
    • http://mazaw.forceofnaturehandhewnconstruction.ca/uploads/1/3/0/8/130874617/bukubu_barufemufa.pdfIn PDF document text
    • http://files.propcustomz.com/uploads/1/3/1/4/131406275/8ce7138b17.pdfIn PDF document text
    • http://nupewefu.isadaddy.com/uploads/1/3/2/6/132681885/6633640.pdfIn PDF document text
    • http://dewivazuv.rogueartisanfoods.com/uploads/1/3/1/3/131397983/1788813.pdfIn PDF document text
    • http://files.myswimplatform.com/uploads/1/3/1/4/131453917/34881e57a.pdfIn PDF document text
    • http://files.joshuaduncanartist.com/uploads/1/3/2/7/132740700/e00ada7.pdfIn PDF document text
    • http://jazovu.freedomk9s.com/uploads/1/3/2/6/132695818/jozigalugegepox.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/1/0430/1747/0101/files/menunutuked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/71799200453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0549/9803/files/84329445474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9623/5415/files/le_journal_el_watan_d_aujourd_hui.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/wetigaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/2302/3518/files/valutulesariv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/killer_karl_krupp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/beautiful_disaster_series_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7292/8409/files/cateye_velo_wireless_cc-_vt235w_manual.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_off000054ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54EE 5204 bytes
SHA-256: 7b5f1954391dc7eb85bd3561345448c4bcef041b017a805326734e9afff8cc07
font_01_sfnt_off000066b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B4 10376 bytes
SHA-256: 0e34d3f52240b468786b6b7c95b679e33a4babf015b358d24bae930c40b916ee