Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae478eb6aa085f9…

MALICIOUS

PDF

51.5 KB Created: 2020-08-19 14:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3dc0ee33f184e78608cdda13532bed0 SHA-1: f2fe81812a447022af34e8775f2f8ab2830d4a37 SHA-256: fae478eb6aa085f963363d1519a913bf3c3cb7a2d1e07f919cea0c3b392366c5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=blanco+brown+the+git+up++free', which is a known malicious redirector. The presence of 30 external PDF links further indicates a link farm designed to distribute malicious content.

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=blanco+brown+the+git+up++free
    • http://files.texassynergy.com/uploads/1/3/0/7/130738892/kumurasivip_kalonasavakete_kijawi_kazobinaxet.pdf
    • http://files.icsc-companies.com/uploads/1/3/1/6/131636678/5828212.pdf
    • http://mawefu.k-p1964.org/uploads/1/3/1/3/131380429/geraromu.pdf
    • http://files.allislandmartialarts.com/uploads/1/3/1/3/131398224/cdd72a2.pdf
    • http://tuzod.qsdgroup.com.au/uploads/1/3/0/7/130776138/wuputadad_kufadadalivupar_jifaja.pdf
    • https://cdn.shopify.com/s/files/1/0428/8702/0703/files/rupiropebovegapagazalak.pdf
    • https://cdn.shopify.com/s/files/1/0435/5899/4088/files/1154555047.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/wafeberujejito.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotalufakelani.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/jusebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9885/6867/files/tecumseh_lawn_mower.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/sexovigosazewokizuxare.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/lajokajelosuxixagim.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/54067394965.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/nuvoxofitovitegiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2780/files/gaporitufosugeni.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_off000089b5.bin
1fc0d713c7d378a60ddb7dc3413e9a3332bb2b5cb61a09a6f97caf40088c1bd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x89B5 5380 bytes
font_01_sfnt_off00009c12.bin
05e6eed0a5c87d6f03851a0b4c06cfff9235e879d722111aa344e5f97f19df9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C12 10688 bytes