Malicious PDF — malware analysis report

Static analysis result for SHA-256 c871eb30eaf0ad48…

MALICIOUS

PDF

47.8 KB Created: 2020-08-01 13:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae6c84dd1c61f6f374b70f9f841da38 SHA-1: 2ed2e5379ccfa8d2c2790f57b8569f3d671226e0 SHA-256: c871eb30eaf0ad48e143ac6c77e3a2e3e63f1f2496c446264eeb499c59432bd2
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded document body contains a URL pointing to a known malicious redirector, 'https://ttraff.cc/pify?keyword=e2%2525+80%2525+9cdreb1e%2525+e2%2525+80%2525+9d'. This indicates the document's primary purpose is to lure users to external, potentially harmful, websites. The ML classifier also 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.cc/pify?keyword=e2%2525+80%2525+9cdreb1e%2525+e2%2525+80%2525+9d
    • http://files.residence-monte.com/uploads/1/3/0/9/130969576/de0d9654067.pdf
    • http://files.optometriefonctionnelle.fr/uploads/1/3/1/4/131437149/3580896.pdf
    • http://files.accesswellbeing.org/uploads/1/3/0/7/130775174/badcb8b89.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24803542318.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2026/files/257038693.pdf
    • https://cdn.shopify.com/s/files/1/0438/4233/8981/files/48693218356.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/ratogadafijefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6922/files/peripiterawif.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/carrier_reefer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/99352944627.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/favonarudamesulijow.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1671/files/21815607911.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_off00005e34.bin
3c2350500d5b030f13257afe1829a90685db0e2ba6dc316db18698a373b4bf74
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E34 6600 bytes
font_01_sfnt_off00006e8e.bin
db9512d6d5a408dd73652f63b3a7390586954d429f43faf78df93e13c3949688
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8E 5520 bytes
font_02_sfnt_off00008150.bin
c654f7321445cd288a886dc657f5cac7e5a7e180ec5aef313cb879dd0ef5b08f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8150 15688 bytes