Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f35bba39ad5dd0…

MALICIOUS

PDF

41.6 KB Created: 2020-11-03 20:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23bc212bf011cac6856ff4888a91d39 SHA-1: debd6a471621b4696eadf2643542488cb24f3f72 SHA-256: d4f35bba39ad5dd049e0cff26cbb2c8e53b242a831362e6410a59c9a4258685a
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/wb?keyword=celebrity%20voice%20changer%20lite%20apk
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5f9fe25627109.pdf
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f9c35413fb0f.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279107.pdf
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/bigodowilu.pdf
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f89c53186836.pdf
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f95d9ced4fd5.pdf
    • https://uploads.strikinglycdn.com/files/f04c1716-7483-4b98-b454-ba11bcc80954/89426550245.pdf
    • https://uploads.strikinglycdn.com/files/5ec476d6-ada9-4a06-bb65-0cf9c3baa18a/57148039711.pdf
    • https://uploads.strikinglycdn.com/files/a8aacde4-8b09-4461-9e87-f39795aa8844/62031960058.pdf
    • https://uploads.strikinglycdn.com/files/205c695a-72c8-4f78-9b81-9fc830adb064/pijurapinubesubuko.pdf
    • https://uploads.strikinglycdn.com/files/1121c4db-8798-41ec-a1e3-6cfeb26f2c33/55600323845.pdf
    • https://uploads.strikinglycdn.com/files/9e89ae25-f7a2-49ef-9ca5-5f14e3131076/nufuvawufulosukezitar.pdf
    • https://uploads.strikinglycdn.com/files/6cc21cee-d0d0-49cb-98fa-0b044a437cfc/fepopaxikixasesito.pdf
    • https://uploads.strikinglycdn.com/files/b5021159-132c-4b26-95c3-4fe102e3d542/gujerumisebenadane.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_off0000622b.bin
531153da30d26f0a41a6e7c1cb0a8f0b774b08c3f5744285c3d4b50014e7e135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 5288 bytes
font_01_sfnt_off0000742e.bin
b8635c353e72039822825b798ae9f6a5c0fdf4ebc40b0a7697cd802f9f46eee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742E 11056 bytes

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