Malicious PDF — malware analysis report

Static analysis result for SHA-256 651be7dd30aaea08…

MALICIOUS

PDF

43.5 KB Created: 2020-08-25 03:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c80fd33bbc90379e7fed00b8490d37 SHA-1: 6d58d1388f470e1e08127302518e5886c6ff3b23 SHA-256: 651be7dd30aaea08c18a3ab458f62742bf9e8c7f6545f590bce4ebf4a9968d78
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'teamviewer 12 for pc filehippo'. The document body, though heavily obfuscated, contains this URL and numerous other PDF links, suggesting a link farm or redirection attempt. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's intent is to trick users into installing remote support tools, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=teamviewer+12++for+pc+filehippo
    • http://files.peopleforterrellmckinney.com/uploads/1/3/1/4/131407423/2362326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/2762/6134/files/revewuzuwikuzirabuji.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/42807870955.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/nedoreguduxafixug.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/letatufobagijaxipudukep.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/batapefuvubuwowewedo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9776/5528/files/20835234022.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/fenetolipagutob.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/savufoveme.pdf
    • https://cdn.shopify.com/s/files/1/0437/8496/2200/files/58714992820.pdf
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/winuzaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2581/files/1-_99_invention_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2216/files/manual_muscle_testing_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f89.bin
97cf117e17a2b9b0e5e908ba4f48ba5fc5ab3cabf490691ebe353233a4221c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F89 4964 bytes
font_01_sfnt_off00007083.bin
f4642b547c5cb273a7a4bc656fd70fedbd3e701697a4154ef59b18ca063b5101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7083 10120 bytes
font_02_sfnt_off00009318.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9318 4324 bytes

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