Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d1f0ef8513de27…

MALICIOUS

PDF

58.8 KB Created: 2020-09-18 04:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 080248a56738f6dbdc1486fed567a2b7 SHA-1: 6fdbe8dfe3c9461c9934850f3b1c316226166ef4 SHA-256: 25d1f0ef8513de27819ac4afcc0533ea060e7f6dea6ef762d197b4467ebf36c5
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.me/wix?keyword=milli+micro+nano+scale'. Another critical heuristic indicated a link farm, with many external PDF links. The document body itself is largely obfuscated but contains some of the extracted URLs. No scripts were extracted from this sample.

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.me/wix?keyword=milli+micro+nano+scale
    • http://pudut.pacificcircleconsortium.org/uploads/1/3/0/7/130776499/jagibi-ruxag.pdf
    • http://jofof.odcca.net/uploads/1/3/1/1/131164293/ribejaxutefu.pdf
    • http://files.rachelannsaylor.com/uploads/1/3/1/4/131482832/6782605.pdf
    • http://titekaxi.2cvtv.co.uk/uploads/1/3/1/3/131383483/befulip_mezevuralumim_zezajakud.pdf
    • http://numogot.lawfirmcebu.com/uploads/1/3/0/8/130874118/mibowodibulewevawi.pdf
    • https://f9cb645f-844a-488a-b2df-b47faf0d103b.filesusr.com/ugd/c8d394_882944bec8b5457a8a58375f1fce747e.pdf?index=true
    • https://1463a640-c276-4642-b372-be2c5f175678.filesusr.com/ugd/409ca8_b97f9d9dec8c49fdb778e2f3a16c510d.pdf?index=true
    • https://3a3ca1c3-75e7-4772-bead-f4fd61f7f4ca.filesusr.com/ugd/b14caa_67e6b8e34a3043ddb42c0e39a51209f2.pdf?index=true
    • https://644bd041-3f58-44b9-b5b2-89a73f284791.filesusr.com/ugd/682d1c_adece741d0e9414a9ccc8faa3c3abc93.pdf?index=true
    • https://bf1342e6-4c7c-4e1c-9a6b-7176a2c7d527.filesusr.com/ugd/5b9a87_64c70001f3654ee6af44f7742dbd121e.pdf?index=true
    • https://ccabc9ce-6760-4e50-9526-e6a3663c1ea4.filesusr.com/ugd/ade4e6_91d78dc0a62d48d3a4bea730b5682ee5.pdf?index=true
    • https://62bb187f-44c9-4c86-a6e8-4ce58472cd3a.filesusr.com/ugd/e4ee87_aa8a7e13f0964e5484b2f6bba080141d.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/4138/9724/files/asmart_remote_ir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5209/files/55893782011.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_off000088ed.bin
cf60d60cd4cab7a93316c31a0a51f1e319927aa2ecfe1cc47a98f917939ef660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88ED 4952 bytes
font_01_sfnt_off000099b0.bin
e661b52445a5d6412bf7e010202d3b7c4ea55a4099ec8234a9b257b44275d712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B0 15228 bytes
font_02_sfnt_off0000c955.bin
8a4ba897444ef0b3fd73b104800ba7b5a9592f361c66600ec003ada5ae50c7a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 16148 bytes

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