Malicious PDF — malware analysis report

Static analysis result for SHA-256 833a88ac8bfb484a…

MALICIOUS

PDF

47.6 KB Created: 2020-08-10 20:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 031b5e0e5f70ebf2115f79e31de023dd SHA-1: 673bb6a711fcc475518427d95a3a7a22374e86a0 SHA-256: 833a88ac8bfb484ac9c34c5a98f66ade08ffa628c2c2d635181b52031a825e27
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to redirector infrastructure designed to obscure the final malicious destination. The primary lure, "cost accounting mba notes pdf", is presented alongside a link to a known malicious redirector, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=cost+accounting+mba+notes+pdf In PDF document text
    • http://files.cambridgeartfair.com/uploads/1/3/1/0/131070313/1a54fd3c5.pdfIn PDF document text
    • http://files.knappbiz.com/uploads/1/3/0/7/130776220/lufotinabuzezobaf.pdfIn PDF document text
    • http://files.bornleaderconsulting.com/uploads/1/3/2/6/132682040/fusabinobafape.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/1/0433/2689/8344/files/91798415883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/mtg_arena_wineskin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8427/4069/files/cell_structure_and_function_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/68749496919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/36431022850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/74001098583.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/26914237052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/android_sqlite_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9746/4731/files/konimerapefij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9929/0776/files/manual_snow_plows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0385/3476/files/25148936456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/tezomupatatowitujiwotig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/pipafemututovuzu.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000685c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685C 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off00007944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7944 5392 bytes
SHA-256: ac3af43cbf7da4f0dd44f8a7d0035a6edb2017e763f8424f708d9e824a2263f7
font_02_sfnt_off00008b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B88 11444 bytes
SHA-256: 3b617967617c2562a25e4948231ea4359cf3d6f8786c09b28f7233dc08a8b891