Malicious PDF — malware analysis report

Static analysis result for SHA-256 7091001e8259d3e6…

MALICIOUS

PDF

47.3 KB Created: 2020-07-28 03:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ea3539554ae20dbc6e701b052606276 SHA-1: 92e785037b71c9eae35e4f346e87a99c2ad10da5 SHA-256: 7091001e8259d3e6c54de5a7674193be9307303efa45bd6dc3a77492f9f50118
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=channel+islands+fishing+guide
    • http://files.lynseylandry.com/uploads/1/3/1/4/131453276/6496342.pdf
    • http://files.encounteract.com/uploads/1/3/1/8/131871597/ab68ff3d66.pdf
    • http://files.nichointernational.com/uploads/1/3/0/7/130776167/lubarijozanolovedej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/papapunufajegisoxatufiniw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2544/0669/files/55763260455.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1157/9809/files/fozafezokujoki.pdf
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/85145404234.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/memakokafesuvorisi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/zegariz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/wuzosutubolofaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/teduxumebupovo.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_off00007e42.bin
a2b970d933b150768fce6379f9b7fff623b182b5dc5a355838fcb82251d88c51
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E42 4788 bytes
font_01_sfnt_off00008e71.bin
65c700abcd83bbe2285313fc673201be4679b745a829e7fc42d8c0e8d6b3124f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E71 9828 bytes