Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ad0c60cec115a8…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 14:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e54acb1ed658b770a7c37209557e628d SHA-1: 9d9df8a53baf08155fabad0a6080d971eb05d917 SHA-256: 82ad0c60cec115a81f1b0cfa95333769307b902352b33b1ec80b72d8c21446df
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains multiple embedded links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'geometry word problems' and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of numerous links to external PDFs, many hosted on Shopify, suggests an attempt to create a large network of SEO-optimized content, potentially to distribute malware or engage in phishing.

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/wix?keyword=geometry+word+problems+with+solutions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2755/4723/files/physical_appearance_and_personality_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/3766/2103/files/gastronomy_tourism.pdf
    • https://cdn.shopify.com/s/files/1/0463/1481/5648/files/99946099177.pdf
    • https://static.usrfiles.com/ugd/a64c8c_c893cc25b15f475d8add8637192e4782.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a77fbba861a436f9ccbe225fd91bce4.pdf
    • https://static.usrfiles.com/ugd/de65f7_04fb488f408444dcbca0ad748fda325b.pdf
    • https://static.usrfiles.com/ugd/b8c837_396629ec99d94ffd808ba9b983161948.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/pdf_books_free_download_civil_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/wuzotozamav.pdf
    • https://cdn.shopify.com/s/files/1/0462/5763/5477/files/fijuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4015/files/43845060631.pdf
    • https://cdn.shopify.com/s/files/1/0447/9221/7761/files/33470232225.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/31117645655.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/43108260484.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/15225379393.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_off000065c2.bin
7f0468188b02f68c4f44e86d7b034f46bef9b3ea60fb4008c08fe8c42436ebe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C2 5564 bytes
font_01_sfnt_off0000789b.bin
0e72e4da1e27fb482898ed9e27517a534fc49652bd1ba03de0627fb5ef1ad549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789B 13552 bytes

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