Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f75e7a4a8608a7…

MALICIOUS

PDF

50.9 KB Created: 2020-08-02 20:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e61fb39e924b46e240b02494f122129c SHA-1: 799be373e62ed358ee618e11f7d3c530b8980bf4 SHA-256: e1f75e7a4a8608a7ec932cc057568ed7d10a1b7c0337fcf7503655947582fe8d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=crime+busters+science+olympiad', which is a strong indicator of a phishing or redirection attempt. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm designed to obscure the ultimate malicious destination.

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=crime+busters+science+olympiad
    • http://files.petoskeycenteriop.com/uploads/1/3/2/3/132302848/5228514.pdf
    • http://files.gorhamperformance.com/uploads/1/3/2/8/132815767/6704503.pdf
    • http://files.townofwillsboro.com/uploads/1/3/0/9/130969742/gaxasifizoki.pdf
    • http://files.theyogaconnectionstudio.com/uploads/1/3/0/9/130969674/a0705.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56802730071.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/90039433731.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/revub.pdf
    • https://cdn.shopify.com/s/files/1/0427/8566/9279/files/netuwosasigupev.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/tuvusenusat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85286147205.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/kifiladugomovuzuvoxuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/39490319704.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8216/2084/files/jubiguba.pdf
    • https://cdn.shopify.com/s/files/1/0435/7590/2363/files/75445819983.pdf
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/ipc_a_610.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6324/files/bibabixerudafexugon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000796a.bin
ca0e066a506f026c5a9b6a9ccbd0ccc479d621f22ecbb82a6788d16626632f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796A 5364 bytes
font_01_sfnt_off00008b89.bin
86815f27ddc26ef9a9427115cda5446792a94fa85198b694bdaa3f7d1df48557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B89 11172 bytes
font_02_sfnt_off0000b01f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB01F 4324 bytes

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