Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c8a1e0862848ed…

MALICIOUS

PDF

46.1 KB Created: 2020-08-02 14:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19fe220bd837362363598577712ba4d8 SHA-1: 8eee13d911a388d13f75cfacf76120e021b68971 SHA-256: 65c8a1e0862848ed70c8c87e50c54a46d22c95937cc53668be4b755b24d5f9ed
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=4187+pdf+fillable'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm designed to redirect users to malicious sites. The ML classifier strongly supports the malicious verdict.

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=4187+pdf+fillable
    • http://files.laparliere.com/uploads/1/3/1/4/131455232/a1c8e83c.pdf
    • http://files.dunnvilleminorfastball.com/uploads/1/3/1/1/131164308/4cdae698a0a0d.pdf
    • http://files.sacredfamiliesinternational.org/uploads/1/3/0/7/130775384/judanuse-jazukowivu.pdf
    • http://files.kpoptips.com/uploads/1/3/1/4/131454816/foxerizu_rabogovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9311/5548/files/19224177549.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/fexamux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/78330575637.pdf
    • https://cdn.shopify.com/s/files/1/0437/3744/8609/files/rigak.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/17854407193.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2392/files/fedefugifelepefidigopuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/65146647986.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/44091937652.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/golakufajapafunokunizi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5848/files/74857513628.pdf
    • https://cdn.shopify.com/s/files/1/0437/7251/0362/files/70820403046.pdf
    • https://cdn.shopify.com/s/files/1/0433/3151/8622/files/33827244787.pdf
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/duvebekaduk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/19058022037.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_off00006362.bin
9e15b5b082a0fddf5826ca9f85bec68177eb796705d036351a3854a0e661f6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 4712 bytes
font_01_sfnt_off0000736e.bin
4061c59043ad59d2cee163494585bd90b827dc35a9960c3e628ca0e30d315806		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736E 13440 bytes
font_02_sfnt_off00009d54.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D54 4324 bytes

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