Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da2ad398d7025d4…

MALICIOUS

PDF

45.0 KB Created: 2020-08-17 01:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d048174696cb126f889cf72d01ef51b1 SHA-1: cc09ca3fbdbb0b845393e443d782c2e6cdd4d93e SHA-256: 9da2ad398d7025d498b4292c513ed01a0b4796241aca94559ae1b751c057bf60
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to impersonate a Chrome shutdown notification to lure users. The document also hosts a large number of other PDF files on Shopify domains, likely as part of an SEO link farm to improve the ranking of the malicious redirector. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=chrome+shutdown++complete
    • http://files.defnepansiyon.co.uk/uploads/1/3/2/7/132710772/tameb.pdf
    • http://files.shadowlandgsp.com/uploads/1/3/2/7/132740204/2546107.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/juxopinomutezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/99810904416.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5010/files/analytical_questions.pdf
    • https://cdn.shopify.com/s/files/1/0436/9681/6282/files/11397361668.pdf
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/siemens_invision_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0812/1242/files/netejolukopasuzezi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/faduxome.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/83343976680.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0392/files/36838377877.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodujanizovu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007228.bin
6429f1a50b0e24d29adb14bf6ee360f2a9c2cc00e23564b035d61927d34cd88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7228 5100 bytes
font_01_sfnt_off0000836e.bin
ba78185ec109d8d7d2c202fc36f5ae8f20e2e6deb261000ce914a26111a55e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836E 10412 bytes

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