Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da8047cad8bbe84…

MALICIOUS

PDF

39.8 KB Created: 2020-08-24 16:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 171d309d2a422f77d5cba6b5302f8a6a SHA-1: c67ee1915f00706eb2fd009439c229f371eea049 SHA-256: 3da8047cad8bbe844f0b0b4d16619ecbbfe90400d91330e7eebcd23b18c6920c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=beek+familiar+spirit+android', which is also listed as a malicious redirector. Additionally, the PDF contains a large number of embedded URLs pointing to Shopify domains, suggesting a link farm designed to obscure the ultimate destination and potentially distribute malware or conduct 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.cc/pify?keyword=beek+familiar+spirit+android
    • http://files.koreabusinessgroup.com/uploads/1/3/2/6/132696174/luxezo.pdf
    • http://files.rangecustomhomes.com/uploads/1/3/1/3/131381612/6606813.pdf
    • http://files.hummingbirdhummingbird.com/uploads/1/3/1/6/131606670/vufarevetuvixab.pdf
    • http://gobulo.ywcahealthandfitness.org/uploads/1/3/2/6/132681481/d3d4075199.pdf
    • http://files.furgetusnotrescue.org/uploads/1/3/0/8/130814605/rikareweme.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6993/files/88268710185.pdf
    • https://cdn.shopify.com/s/files/1/0462/8126/1205/files/xeduza.pdf
    • https://cdn.shopify.com/s/files/1/0436/9373/6089/files/10243464867.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/bobofasuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/74022967983.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/66915608875.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/98748109716.pdf
    • https://cdn.shopify.com/s/files/1/0435/3064/9749/files/dimuzobepap.pdf
    • https://cdn.shopify.com/s/files/1/0464/9543/2872/files/wujenerovoxovokono.pdf
    • https://cdn.shopify.com/s/files/1/0449/3407/0440/files/pusixonasuwutuxoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/tuzonexilamemivar.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/trans_siberian_orchestra_carol_of_the_bells_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/musulosasiwiluk.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_off00004a1d.bin
b6a9448ef87f6c9b424066a3be8c9d0b46f3a2a49a338a55cdfbe46d64283c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1D 4696 bytes
font_01_sfnt_off00005a90.bin
605ba5bfd4ff8349b786c23260631d0a904c1d63bd59480f2128a90917b03882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A90 5300 bytes
font_02_sfnt_off00006c7e.bin
97a7d336c052e97fa4f3c39f5925d0cc5ff59c0cfc8f02698410cc7de2717fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7E 11492 bytes

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