Malicious PDF — malware analysis report

Static analysis result for SHA-256 7022480cd8b61d1d…

MALICIOUS

PDF

72.8 KB Created: 2020-08-24 11:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9f8e818fe38fc6b623be9389e4070ed SHA-1: 047559215df143d39f249fb1961f478ed23e9ad8 SHA-256: 7022480cd8b61d1dfc25d2696f9ff9c959823a20b154967b8d2999eb5590f821
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to host or deliver a secondary payload.

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/pify?keyword=landfill+gas+monitoring+report
    • http://legef.grottonsinchile.org/uploads/1/3/0/8/130874330/8628828.pdf
    • http://files.mnrpcv.org/uploads/1/3/1/3/131378771/ef524ab75d.pdf
    • http://files.thewaveindustries.com/uploads/1/3/1/4/131413837/a1b902b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3142/0314/files/6024881132.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/verav.pdf
    • https://cdn.shopify.com/s/files/1/0436/5575/7977/files/5856015140.pdf
    • https://cdn.shopify.com/s/files/1/0440/4923/6118/files/aws_certification_dumps_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/puziritotesokebate.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/80019785677.pdf
    • https://cdn.shopify.com/s/files/1/0432/0129/8594/files/jujabosolusiba.pdf
    • https://cdn.shopify.com/s/files/1/0436/2102/3904/files/precalculus_stewart_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/cricket_game_for_pc_100_mb.pdf
    • https://cdn.shopify.com/s/files/1/0440/7502/4549/files/daxavixozigitufutaro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0436/2744/6435/files/python_flatten_list_of_lists.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/62876715241.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_off0000dffd.bin
e10e556afde0a1af816e405ba2a10b5f5b59f6049c281b66f2c30ea141e2c23a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 5300 bytes
font_01_sfnt_off0000f1f0.bin
5f57ba1f25923fe95f8730f5afe964bc7237d2a354dc173c5a4638eecf538088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 10616 bytes

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