Malicious PDF — malware analysis report

Static analysis result for SHA-256 748cb3858734c998…

MALICIOUS

PDF

46.1 KB Created: 2020-08-11 09:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69a1616b9b1007c65ca421d5dcfd8cfb SHA-1: 93dcbcc264db6f42c6bfa745d4fd73d025fd3d3c SHA-256: 748cb3858734c9987da0421797af824373c9935e19a2f668d65114e7c5bb9f8e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to 'rainfed agriculture notes pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this redirection. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are likely part of a link farm designed to attract traffic. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=rainfed%20agriculture%20notes%20pdf
    • http://files.livinglifeyellow.com/uploads/1/3/1/0/131070149/6c6f62cca64e.pdf
    • http://files.themusicstudiostafford.com/uploads/1/3/1/0/131070151/bamabowamul.pdf
    • http://nudubabel.goodbless.us/uploads/1/3/1/3/131379578/zakarolu-xululufagejaw-matowojed-sukovomijexaf.pdf
    • http://files.jdfitness360.com/uploads/1/3/1/3/131381414/rorikifadixunufizu.pdf
    • http://files.stpiusinprint.co.uk/uploads/1/3/0/7/130740013/xoxoxelapanuper.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9867/5102/files/treble_clef_notes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/10792968724.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/8997/files/fibixitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8207/1716/files/1972_gmc_jimmy.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/32811938505.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/6679345438.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/80796246197.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/tosiniravujowixukefami.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/fuxapulafekab.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/644702016.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/bilenot.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8156/files/68722026674.pdf
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/jebegelabusoxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/fosilerelufulu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000762c.bin
9514c10dee979236dba993c323918d33426cbed97c65b6810b447ec1e3f7a7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762C 5328 bytes
font_01_sfnt_off00008860.bin
29719be49f9c7a64dc3ac3e9e7a92a07f51f0e18c34cbcc2fda64033d5df7038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8860 10240 bytes

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