Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d229baa0468df8…

MALICIOUS

PDF

40.7 KB Created: 2020-08-12 07:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6682ad9642170302e9f68b7d877398 SHA-1: 8c1d300a3c0042d64efcb409854b2b5e5deb4829 SHA-256: 18d229baa0468df8e4d079b42a912e01beb60ee8c498f2b56789c5c12b862e81
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse. One of the primary links, https://ttraff.ru/wb?keyword=percentages%20revision%20worksheet%20ks2, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of educational content.

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.ru/wb?keyword=percentages%20revision%20worksheet%20ks2
    • http://files.artwithperry.com/uploads/1/3/1/4/131406288/vovudoloz-xetijutusirovi.pdf
    • http://files.tritochangetheworld.org/uploads/1/3/1/8/131871692/sukodire.pdf
    • http://dobes.leverageleadership.org/uploads/1/3/1/3/131383664/nemibobimawelube.pdf
    • http://files.itseyez.com/uploads/1/3/0/7/130739234/745609.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/knowledge_encyclopedia_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/9138/4736/files/binuzetomonarit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigazisamakolomomabixefox.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4807/files/goxivasukera.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0431/0620/5857/files/91401663631.pdf
    • https://cdn.shopify.com/s/files/1/0433/4233/2057/files/reading_worksheets_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0443/8307/6518/files/jaragivobiwefenol.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/podatejebarorexol.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6774/files/british_council_ielts_practice_book.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_off00005eda.bin
218b6176c54649a4fb1b7418282962487ffa2deaeb31681d568d8f5896a80a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDA 5380 bytes
font_01_sfnt_off00007136.bin
3c9dc0c16ba38c36e9b2e634e3042f2cad10e861caf8384714c96198d3918849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 10612 bytes

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