Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad8960957e973a0…

MALICIOUS

PDF

51.9 KB Created: 2020-07-23 08:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1539d205e6cd15c7fadb7fe75ef49542 SHA-1: d25ae6d292fdbc5b7b90d1c870b7ab44d2a8c5ef SHA-256: 6ad8960957e973a0f590b019e4fd936ba6273a1a23b7131e5206f244a8bc06b9
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 pointing to Shopify domains hosting other PDFs, which is indicative of a link farm designed to obscure malicious redirectors. The primary malicious URL identified is `https://ttraff.cc/wb?keyword=safe%204.6%20scrum%20master%20exam%20questions%20and%20answers%20pdf`, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to exam questions, aligning with the link farm's purpose.

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=safe%204.6%20scrum%20master%20exam%20questions%20and%20answers%20pdf
    • http://files.ipswichgaragedoors.com/uploads/1/3/2/6/132696210/tulozedubobeteful.pdf
    • http://files.topperbots4230.com/uploads/1/3/1/4/131437457/e3f7075.pdf
    • http://files.mindbekind.ca/uploads/1/3/2/7/132740172/xikemo.pdf
    • http://files.fmacademy.com.au/uploads/1/3/0/9/130969705/2141481.pdf
    • http://files.jimhewit.com/uploads/1/3/0/8/130874587/lixewibaxuta-popobufusuduvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/6445923014.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45598155969.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4157/files/71548590020.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/36414912075.pdf
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/54315591338.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/wopotanisiloverejigox.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/fanigofajus.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/jategopipuzezefimuxilimut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6878/4791/files/zajewudiwudijitodip.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/80711582676.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/75517144226.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/depodirenaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/dabuwexug.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_off00008867.bin
447fcbd1aa838d9d45b337ea6966363ae18e955c7db07e4fe6ebdcd8ed47fa50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8867 5812 bytes
font_01_sfnt_off00009c30.bin
ab123d3b4dabf0cba1435f376027f5fb6eb81a56802f22c6b60674376852e6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C30 11140 bytes

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