Malicious PDF — malware analysis report

Static analysis result for SHA-256 806b7ff742c08315…

MALICIOUS

PDF

42.5 KB Created: 2020-09-11 10:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0276e2be1833bd9a779f909099b654e5 SHA-1: 9069c526367e67c5fc594374c7430af37dc584cc SHA-256: 806b7ff742c08315ad78e86936a70415dcd2fc3144b5d3790d71c7515121246a
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though corrupted, contains a URL that appears to be a lure for cracked Android game APKs. The presence of a download button lure and the ML classifier's high confidence further support a malicious intent to redirect users to potentially harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=android+games+apk+cracked
    • http://vorox.noiwc.info/uploads/1/3/1/8/131856369/gerop.pdf
    • http://files.duepiunews.com/uploads/1/3/2/6/132681863/mugovukatuj-tugomeve.pdf
    • http://rekewanab.ksyme.org/uploads/1/3/1/3/131380042/6687646.pdf
    • http://files.neaworks.com/uploads/1/3/0/8/130813399/cebdd4a6466420.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/39116226844.pdf
    • https://cdn.shopify.com/s/files/1/0450/9057/0405/files/mcdonalds_job_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7639/files/sefejukiraliduvup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/46812579523.pdf
    • https://cdn.shopify.com/s/files/1/0434/4938/5126/files/wejumefilera.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/codex_orks_warhammer_40k.pdf
    • https://cdn.shopify.com/s/files/1/0433/5514/4347/files/hovercraft_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/xezakexavuzakalofu.pdf
    • https://cdn.shopify.com/s/files/1/0446/1946/4867/files/habacuque_hernandes_dias_lopes.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/difference_between_shielded_and_unshielded_twisted_pair_cable.pdf
    • https://cdn.shopify.com/s/files/1/0429/3672/9766/files/gusuzuxilodosef.pdf
    • https://cdn.shopify.com/s/files/1/0428/2122/2567/files/aeriforme_significado_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0407/files/pneumatic_power_tools.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_off00006844.bin
d19b681e20704d34c9417c9f2f1fea239987f5a90c24a48716e6f1142b31e617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6844 5412 bytes
font_01_sfnt_off00007aa1.bin
6fd7deb6d310d85a372c7d82992a5542f8ff510144e6a91f5a6856e3e5b0176e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA1 10040 bytes

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