Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8113052e3119ff…

MALICIOUS

PDF

39.8 KB Created: 2020-08-23 15:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e94e264e9d1591479d1b4b32254cf521 SHA-1: 0e5e954986b6f5ad885b495185231951ef17855c SHA-256: 6d8113052e3119ffadd3b691fddd02f0ddab754337229621263a577977f07065
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous links to external PDFs, including a primary link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to malicious infrastructure, likely for further exploitation or 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/pify?keyword=alcor%25C3%25A3o+comentado+pdf
    • http://volak.thutupallilab.com/uploads/1/3/1/6/131606346/gemozubogexitiros.pdf
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/miwaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soparuvuridove.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8601/files/luxenowozegibafujug.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/69966693235.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/42640211080.pdf
    • https://cdn.shopify.com/s/files/1/0438/4600/8982/files/reinstall_npm_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/baby_birthday_video_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/99481936168.pdf
    • https://cdn.shopify.com/s/files/1/0434/6888/2072/files/25955961118.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_off00005b4d.bin
a552486a31542100824a444a7f7017ca597c6f2bfe35646d06380e74f6ccc230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4D 5428 bytes
font_01_sfnt_off00006d0f.bin
d2d93fad2a090a13022daedc91ec92c88a4baf6070364c04c9c21200c642a656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0F 11916 bytes

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